the look on your face when the loud beep goes off the first time and you turn and ask the camera "did you hear that" is priceless.

There are so many shops with people who will throw parts at it and cost you a fortune. I wish we had more like you!

Nice that you failed to poke fun at the shop that had it before. You come off as humble and honest, great combination.

You’re the MAN just fixed a 2003 Expedition and that exact relay solved the problem. Thanks.

I can honestly say that my DIY mechanic skills have gone way up since I started watching your vids. You obviously have great skills but what I like the most about you is your attitude... Each time I watch your videos, you make me want to go fix something !.. It shows that you love what you do and this transcend through the screen. Thank you for doing these and taking the time to explain the logic behind each move you do. Hopefully you keep doing them for a long time. Cheers.

when you turn the key and the truck starts..and I know, it's not even my truck but..it brings a smile to my face.

This guy has helped me so much at my job as a mechanic. Thank you Eric.

Another great video Eric, as an electrical technician in a hospital I have an old saying, "Five minutes with your head, can save an hour with your hands". Think about what it is you are there to repair, digest all the information you have and ask questions. I would say the Verdigris on that relay is the result of that window being left open as a shower of rain came past in the wrong direction and made its way into the A pillar fuse box, corroding that relays pins out. A couple of years ago I did an 11 state tour of the USA and took a trip to the Ford plant in Detroit where I saw the F-150's being assembled, I can tell ya the dash goes in on a gig and two guys secure it up in under two minutes, that fuse-box is already part of the dash and at best they just plug the connectors together before the truck moves along the line, nobody in the plant bent backwards to access it the way you were!! I drive a Ford Mondeo (Ford Fusion in the USA) and the inside fuse-box is under the dash in a similar place, the good ole G-spot is easier to get your fingers on.

All future mechanics need to listen to this guy. The fancy tool doesn’t tell you what’s wrong with the car. The fancy tool only tells you what’s being affected by what’s wrong. From there you have to start analyzing the data stream and doing proper troubleshooting. All I can say is I wish I had a mechanic like this where I live. He knows his stuff!

These videos are valuable insights on how to do stuff. Thank you Eric!

Love the show, Quick and to the point! you are so right about going to the basics sometimes it really pays off , thanks for the show!.

Eric, I've watched many of your videos and have quite an admiration of your skills, patience and knowledge (and humor). I've practiced electronics for over for over 60 years, examined dozens (if not hundreds) of relays and of the very strong opinion your relay corrosion was generated by a front pillar/windshield/cowl leak (salt water). Relays don't self destruct in the manner that was shown. Thanks for sharing your knowledge and time with us 'wannbe' shade tree mechanics!

Nothing better than fixing something some one else could not. Great video as usual.

There are mechanics and there are parts changers, Eric is a true mechanic.

You’re a hell of a mechanic and a wonderful resource. Always a pleasure watching your videos. Wish I had a mechanic like you closer to me!

This is a classic case of needing to keep it simple. Really cool seeing a diagnostic that isn't running around the vehicle looking at everything at once. Start from the bottom and work your way up. Keep up the great videos!

Wow, being a Ford owner myself I am really impressed. Thanks, you have given me hope that there still is a few honest guys out there.

OMG! Dude you nailed it. I had the exact same issues. I watched the video and BAM!. Temporarily switch the relays and it fired right up. Awesome! Thanks and keep them videos coming.

Being an old plant E/I mechanic I can't stress enough the need for Electrical prints. Thank you Eric for the great videos. They keep my mind fresh.

It’s obvious you love what you do. I found that people who are really good at whatever it is they do, always love it. Nice job 👍🏻

José from Lawrence MA thanks you for your video. I was able to start a 2003 Ford F-150 with this video.

You have nothing to apologize for in terms of quality of video OR quality of thought. Great video.

I learned a long time ago to check fuses and relays first. Great video

Mr.O, you are very entertaining and informative. I look to your videos as another time well spent in a classroom, your shop. I look forward to more of your videos that i have not watched and diagnostics I have trouble with. I applaud your expert, basic knowledge on how to approach every situation you encounter. Thank you so much for you being you... and to your back up crew, Mrs O.

Even though this video has been up a while, its still awesome when instincts kick in and a "let's start from square one" attitude make a problem like this seem so trivial. Awesome ninja diagnosis skills, Eric!

You don't need to make these videos any better your down to earth approach makes watching you work a pleasure keep it all going as it is

The video was great! No apologies necessary! Thank you for all you do. You have taught me a lot and gotten me out of a couple of jams. 👍👍

Honestly this video saved me so much headache at first I thought it could’ve been a relay for the starter or my ignition but 5 minutes, ur video and a new relay and now we’re good thank you

Thank you for taking the time to make these videos, I am learning so much.

No need to apologize for anything brotha...Your efforts to produce great informative videos are second to none. Camera's gettin banged around and tough camera angles are all part of the package.. And its a great package.

This was exactly what my problem was. You are the man! Probably saved me a few hundred dollars by not having to take to the dealership/shop to get it figured out. Thanks a lot! I appreciate it!

Great video! Back to basics, a good wiring diagram, a way to find the fuse box, and some alert ears to pick up a change during testing. Nice.

I just really appreciate your KISS method, thanks so much. Got my buddies truck running thanks to your video.

this video just got our truck running thank you!!!!

I know this is an old post but sure helped me out today. I had a no-crank, no-start, flashing antitheft light condition on my 2004 Ford F150. In the past I was able to get the truck to start with the "key on-unlock three times, key off-unlock three times, key on" dance but this time it flat would not work. My scanner was telling me the PCM was not responding. I checked the different ground connections and they were all good (cleaned them up anyway). Then I watched this video, ran the same test light tests, and swapped the fog lamp relay into the PCM power slot and BAM! my truck started right up. Thank you so much!

This was exactly what was wrong with our 2004! Thank you very much for posting this video - even 6 years later it is still helping people!

You are amazing. Your diagnostic skills are great and your delivery is articulate and always takes your audience along as though we are right there with you. May you have great success and become a KZfaq sensation!

That was one of the best videos I've seen of yours, sometimes you just have to stay with the basics and go on from there great video

Eric, I love your sense of curiosity and ability to educate. I've been learning a LOT from your videos. I know this is an old video, but you're removing the rust from the old-school automotive technology classes I took in high school vocational school. Thank you for sharing the experience and logic behind your diagnoses!

Thank you for the videos showing your troubleshooting steps and proving you don't always have to keep throwing parts at it until it runs again. I have a 2006 Milan that was doing the same thing with no com/start/etc and it ended up being the fuse for the circuit that the PATS is on. I figured I had a dead PCM. Once I replaced the fuse, it fired up right away after sitting nearly a year because I didn't want to spend much on a 16 year old car with a salvage title.

As a home mechanic with four of my own to keep running, I have always wanted to throw down and get a bidirectional tool, but the more I watch these videos the less I want to spend all that cash. You proved once again that a code scanner combined with a test light is many times more than enough to diagnose even the most puzzling problems. Great video. I agree with the comment below about watching you and wanting to go fix something after. I love watching your videos even when nothing is broke down and that says a lot about your talent to teach and motivate, oh and of course to diagnose also. Keep up the good work!

Sure is fun to go back in time and revisit old videos of yours. Your procedures haven't changed, a bit more complete today perhaps, but still logical and thorough. Don't ever change. Thanks for sharing.

Just some excellent diagnose work my man! I work in automotive development and frequently get frustrated by our mechanics acting like there's nothing they can do about the simplest of problems. I often dive into engine bays and do the very same stuff you show in these videos. Laptop with all the wiring diagrams and diagnostic software stays closed more often than not - think about the issues, find the most likely cause, test it. 90% of the time works every time.

Eric I live in American Samoa your approach to diagnostics has helped me go back to the basics to start instead of jumping all over the place. Thanks for this great lesson alofa atu wb

Great job I was excited when it started. Please continue to be the best mechanic I've seen on KZfaq your quality and attention to doing the best job is amazing its a shame those other shops didn't do the say due diligence and fix the car. Keep the videos coming Eric!!!!!

i like your down to earth approach, it a real pleasure to see someone think his way though a problem, rather than relying on a computer to solve the problem Thank you

Man, I am so thankful for this video. It’s been a hard couple months with truck repairs (including a tranny rebuild) and this video saved me. Bless you and your family. $24 to fix because of you. Thanks a million.

Mr. O you definitely get some interesting repairs to diagnose. The green crusties will get you every time. Great job!!!

Excellent work. You can tell that you care the way you explain and move camera around. I was on the edge of my seat to when that relay was triggered once for a start with your test light...dang that was fun. Subscribing now!!

Eric O , you give me more and more inspiration every video I watch. As a DIYer mechanic you have given me some invaluable insight into basic automotive diagnostics. Your good heart and patience transfers into a great teacher. Thanks for sharing your automotive repair knowledge via KZfaq and you have a fan for life in me. Keep the videos coming! May GOD continue to bless you and your family as you continue to balance work, family, and making KZfaq videos.

Hi Eric. Thank you so much for this post. I crawled down the same rabbit hole as you did with this truck, except with no scanner or schematics at my disposal. I found a few things on the internet that helped me but eventually led to a dead end. My truck had the exact same problem and solution as yours. I found that fuses 32, 33, and 34 were not getting power just like your issue, but I was unable to isolate it to the PCM relay. Your video helped me tremendously and guided me to the finish line. Thank you.

I love watching your videos. You bring alot of skill and knowledge to the table and have helped many people try and keep some money in their pockets. I dont have this problem, but knowledge is power and I'm sure eventually I'll come across this type of problem.

I am a journeyman tech and Personally I agree with you about flow charts, they have been unhelpful a lot of the time and a waste of time.They take the ability for mechanics to think. ( they can be helpful at times too) Keeping it simple with what ya know , makes customers smile and yourself too. Everyday in the trade a person learns something new. People like you help and teach me to my job better! Thank you so much for your videos!!!

I enjoyed this one. You seemed a little hesitant or lost in the beginning but once you simplified it, had a plan... you straight up nailed it! Excelente! Me gustó! 👍👍

Thanks Eric.... I've been really struggling this winter with my stubborn 04 F150 Triton 3V. First broke a timing guide ...barely limped it a few miles home.....fixed the timing stuff did lash adjusters checked rollers...new oil pump and PS pump that was leaking. It ran ok but stalled when hot....got a code for engine temp sensor....also found vacuum leaks at the intake so I pulled that all apart....did plugs while it was apart and checked the knock sensors.....took my time and was real careful. But then crank but no start.....messed with it a bit the no crank no start ! By now I'm way out of my league....gauges were acting crazy....had a weird clicking..... Found your vid this morning and tried swapping the relays.....started immediatly ! That R02 relay is for fog lights.....I dont even have any ! Thank you so much......I dont have any more $$$$$ to pour into this truk but for now I really need it.

This one's a winner! While hooking up my trailer lights I saw a spark and the engine quit. I watched your video, replaced one trailer light fuse and swapped the same relay you did and that did the trick! When I heard that beep I was so excited! Thank you!

Just love these diagnostic videos. I taught electronic engine controls for 25 years and was in lock step with your every move. I really miss performing these diagnostics. Keep it up

just started to watch your vids.......love them!!!!....your very high skill level and your verbal thinking method and camera work is superior....thanks.

Sorry to have such a late replay. I have seen this same kind of corrosion on a device we use at work to test thermal imagers. We used to use a diluted dishwasher soap as a vacuum leak test chamber as a quality check. There is a power module in this unit that has a connector with spade pins. After several days one of the pins that provided communication would corrode with green crust and cause failure in the mech. These pins werent on the power circuit, however; during the test there was a electrical bias on this line. The problem was that dishwashing detergent has a lot of phosphates that will corrode copper when an electrical bias is applied. We ended up switching to a non-corrosive detect like "snoop" which stopped this from happening. probably similar situation with the relay in this car. Awesome work. I watch you all the time to help me on my vehicles. You do great work.

I truly enjoy being educated with your diagnostic procedures. Keep up the good work !

Nice fix Eric. Checking power,ground, fuses, and relays is always first for me. My grandson watched this with me and said,"Papa,that's what you always tell us when you're helping us with a math problem. Use what you know to find out what you don't know with the information you have". This customer will probably chose you from now on. Best repair videos on youtube as far as I'm concerned.

Thanks man. This helped so much. Exactly my issue!

You are awesome! Very methodical and professional in your approach. Being a mechanic these days is 1/2 computer geek and 1/2 wrench turner

Your videos made me so much more comfortable working on my car, thank you so much!

Wiring diagrams and a test-light. Wiring diagrams are pricey. Test-light is cheap. The knowledge to use them both is priceless. Thanks for the vid!

Thank brothers, that’s really awesome, it just cost me a circuit tester and a relay fuse to fix my truck

BOOOM! Just fixed my 2007 F150 5.4 with identical problem. Shop said starter, I said no way. Why can’t I hear my fuel pump if it was just the starter? Towed the truck home, and after 2 days of google and YouTubing search I found your video kind sir. I RAN to the truck to swap relays. Sure enough, Vrooom She instantly fired up. Your video saved me at least $1000 and multiple tows to different mechanics. Soon as I heard that Ford chime in your video I knew you found the culprit. Thank you thank you. Just FYI we had some fairly cold weather recently and I had used my pickup to jump my semi truck. Took an hour on the jumper cables to get her started. Pretty sure I overheated plenty of the electrical system to cause that relay to go bad...

I like the way you think out of the box in the box, and give hint and trick in a so casual way (human way)... thumbs up !

Nice video I think your logic is excellent dealing with this problem.I have always found thinking simple always seems best.

Mr. O Turns.... Looking at Camera says "Did You Guys Hear That? Priceless! 😂😂 New Sub here... Love this Channel, stay honest

Thank you for this video. It was the same exact problem on my 5.4 Triton. I bought a new battery thinking it was a cranking amps issue and was contemplating a new starter until I saw this video. $18 bucks later, me the wife and the three dogs were taking our Sunday cruise through Key West once again.

Your KZfaq videos have are the best ! I’ve been able to diagnose problems with my cars and trucks with your informative videos.

"What does this one do? Probably don't need it." - famous last words

Back in the 70s, my dad used to be a mechanic at a dealership in Chicago, after work he would go to Dumpys Rucksack or Scrappy McDoogals for tater tots

Great video Eric. Btw from watching this video before hand a while back I learned a few thing's. Well what I learned came in practice when I had a newer freightliner cascadia with a no left turn signals out of the seven way light cord. Well I check power at the relay and got my normal powers and grounds. But my fuse was dead so when the relay clicks on and off my fuse would flash with the test light. That's normal and my relay was clicking and not transferring power. So I pulled the relay back out. Stuck another relay in its place and the turn signals started working. Something relay clicked fine but wasn't transferring power to light my test light at the end of the 7 way. Same relay style in this video is used on that freightliner cascadia. Well I didn't have a relay right away. So I pulled the horn relay out of the 97 dodge ram shop truck. Hahahaha. Thanks Eric and happy new year

I want to thank you for this video, I couldn't figure out my problem after watching it I replaced it, and it's working like a charm

We energize the Control Side of the Relay- and at the same time check for (0) ohms on the Load side. This is the best way to check the Relay. I learned this from ASE Master Jason Varnum.

Damn nice job Mr. O......you da man !.....and yes, I've done the exhaust manifolds on the 05's and up......totally sucks....price em' out the door...

all your videos are entertaining and very helpful, very good knowledge for us backyard bozos. You have really helped clarify a lot of electrical matters for me. Was I younger, I would definitely get a scope and start using it.

Thanks for taking the time to record videos we all learn a lot just because you taking time to show us what you find and it’s cool. Thanks again

thank you so much for teaching us many things the classroom doesn't this is how I learned to keep my vehicles away from money hungry shops

5 1/2 years later... Still a good watch!

Another job. Done done to perfection Mrs. O taught you well both of you are genuine geniuses thanks for the video

I admire your ability to diagnose and repair a vehicle that another shop gave up on.

Eric the car guy talks about mechanics vs technicians. But I think this is a case where the mechanic wins. A mechanic grabs his "scope on a rope" and works the problem where a technician pulls out a scan tool and throws his hands up when it doesn't tell him what to fix. Good on you Mr. O!

Great job! New fan!

Just happened to to be browsing and found this awesome video. My 04 f 150 has been doing about the same thing. It turns on and then it doesn't want to anymore , and then all of a sudden it starts again. I will be looking at that relay in the morning . Awesome video thanks a lot.

Dude I love your diagnostic abilities.Your videos are my favorite.Keep them coming.

Great job Eric, I may have the same problem with my 1999 Ranger !

Once again... Eric O to the rescue!! Yeah it's always exciting to watch your diagnostic skill at work... i learn a bunch from your video's and basics are premo. The ole' scope on a rope!! Love it your a good teacher Eric O.

Excellent tutorial with great filming too. Just really enjoy observing a master at his craft. Thank you Sir for sharing!!!

I have a 2003 ford expedition with a no start problem, this cured it, started right up, thank you for your video. You saved me lots of money.

I would love to see their faces when they watch your video and see what a simple cause it was?

DeoxIT Gold is what I like to use to clean out contacts. It works very well and even prevents future corrosion.

Bloody loved this one. I love watching them all but this was extra good. Thankyou for taking the time to share with us what and how you do things. Andy Australia

Have an 06 with the same problem. Your video helped me get back on the road, good job. Thanks for the helpful info.

I think you just saved me a few $$! Thank you very much

Thak you so much for this video! i just got my truck running again.

And we appreciate your taking the time to explain in detail how do you approach your research.

A very wise man once taught me to always check the basics!!!! You are truly an ace in the hole crackerjack!!!!!