For those needing some context on this video, the idea is that RCA's will be the signal out of the head unit run through the vehicle into the amp, then the power out of the amp will run back up to the dash on your own speaker wires and plug into the factory harness which will then carry the power back throughout the vehicle to the door speakers using factory wiring.. thus completely bypassing the head unit's built in amp and wiring and eliminating the work involved in running your own wires from the amp to each door speaker yourself.

Man, I just just LOVE the professionalism you put into all your connections! Nothing is coming disconnected from one of YOUR installs! Makes me want to run out and stock up on heat shrink now, and FINALLY learn how to solder at 60 years of age! As for so many viewer comments not really understanding what you just did, I found it quite easy to understand. So I'll try to explain it like an old guy would: If you pull your stereo out of the dash, you will find a plug (some factory decks have 2). If you're lucky enough to have a car with an aftermarket deck (head unit as the pros call them), you're in more luck because they will most like already have a Metra-type (or Scosche or some brand) or harness in between your deck and speakers. You simply cut the factory speaker wires that go up into your dash (the end NOT on the side of the harness that go to the deck, and hook the speaker leads from your new amp to those factory wires going up into your dash. What I do on EVERY car audio job I ever do, especially when it's someone else's car, is to FIRST look up the radio wiring diagram (colors) for that specific year, make and model of vehicle FREE on The12Volt's website! I copy them down into my little car audio note book, plus copy them onto a MS Word document to keep on my laptop for future use. So back to this: It's really a simple job! He just made it seem more complicated because he took the time to neatly cut everything (including his fingers a few times I noticed! LOL!), then solder and heat shrink and label everything. I truly believe if he would have just done it like MOST backyard stereo installers, and just crimped wires and connected them a little faster, this video would have been easier to understand. ONE NOTE: when you cut your factory harness wires, make 100% SURE you know exactly which wires are for your speakers before you start cutting! Remember, 1 or more of those wires you could cut will be to constant 12V, another to switched 12V, and another to ground and maybe even illumination/dimmer. So you REALLY need to make sure to cut the correct wires. One way I used to do it, a trick I learned back in the early 80's, was once you narrow down your factory speaker leads but aren't exactly sure which one goes to which speaker? Simply take a C or D battery and strip off a little of the end of each lead. Chances are the wires to each speaker will be CLOSE to the same color, but not always. Anyway, if you take 1 wire and hold it to the bottom of the battery, you can then take each wire one at a time and tap the top of the battery with it. You won't hurt anything, believe me. When you find 2 wires that go the same speaker, you will hear a small pop at one of the speakers and BAM, you found ONE speaker! Tape those 2 leads together and keep doing this until you find the other 4. Sounds cheesy but it works! Especially if you have a wide variety of speaker lead colors like Honda's often do or my current Saturn. OKAY, THAT'S MY 2 CENT COMMENT for now. LOVED this video! But myself, being old and lazy, am going to go a different route to connect my Kenwood KAC-8406 to my factory speakers: I'm going to do the rear-to-front jump trick. Takes less time and less wire. Okay, gotta go read my 2 bibles! s254.photobucket.com/user/Hairball98498/media/Past%20stereo%20stuff/P4080015_zpsb91ddfa1.jpg.html

Great tutorial! I was able to successfully wire up my aftermarket amplifier to my stock speaker harness without any issues. Thanks for sharing your expertise and making this process accessible to DIY enthusiasts like myself. Keep up the good work!

I like the clear heat shrink over the labels idea. Definitely will last longer than bare masking tape.

Exactly what I needed when trying how to power my aftermarket speakers with after market amp using OE speaker wire..Awesome 👍🏻👍🏻

Been doing this since the advent of factory to aftermarket wiring harnesses. Made life SOOO much easier. Especially when installing aftermarket stereos in leased vehicles. Now, if only they could come up with aftermarket plugs to make bypassing factory amplifiers this simple.....🤔

This was the most satisfying wiring video I've ever watched. That was on CLEAN install!

This is the best video on this I have seen. The attention to detail is astonishing. Great job.

Your work is so sharp, so professional!

Thanks for the great detail and time explaining how to manage the wire cutting and splicing. Definitely made me rethink my strategy and taught me how to do this properly and so organized and clean! It raised my expectations of quality, not only when hiring a professional, but with my own work. Beautiful! Thank you!

GREAT VIDEO. This solves a problem I am having with the audio upgrade in my 04 Accord. EXCELLENT attention to detail. Looking forward to your future videos.

Excellent video! Thank you for sharing!

Best informative video I've seen. Very helpful to a beginner such as myself.

High quality video and install. Good background music too. ☺️

Your tutorials are for pros to learn perfection 👍🏻

I am a noon at car audio but after this vid I feel pretty knowledgeable. I’ll be installing mine next week

I like ur job mr..so very neat n details

Fine job Lorenz.....Super professional.

by far the best tutorial ever ! Manage to save tons of cash running new sets of speaker wire.

that's was very useful to me, thanks a lot for demonstration.

Very well done. Excellent.

What's missing is other important information.. 1. is your amp built for the gauge size wire coming from the wire harness. 2. Power into the amp can make the difference of the true wattage output. 3. This easy connect method is brilliant if it's applicable to any car amplifier universally without declining performance from the amp.

Great video, attention to detail on the wiring is great. What I don't get is how this channel only has 35k subs ??

This is a great video! I wish there was a high quality video for connecting to an amp to the stock head unit though

Wow...that harness was a masterpiece. 👏🏽 The installers at Best Buy left a shit show behind my radio

thanks for making this simple for me.

this is the best video on youtube for explaining this. thank you

You are one of the few people ive seen use heat shrink properly (shrink with heat gun) most people use a lighter which is wrong and can damage the heat shrink. You got it right by using the heat gun. CONGRATS!!

Great video and great quality work. If someone doesn't understand how to wire it up after watching this video, they probably don't need to be doing it to begin with!

Awesome video man,thank you. i did have one question,is there any limitations or dos and don'ts when it comes to what kind of amp you can use for this operation? thank you for your time.

I been looking for a video explaining how to do this & you did it so perfectly…. Thank you

Hell Yeah!! I Love It when it's 'HYPER'thetically setup!!

Beautiful work!

*The reason why this video has ONE MILLION views is because I (and likely many others) have had to watch this explanation over and over again in order to understand! :-]

give this man a medal. best video on this by far

Cool dude. Thanks for the demo. A guy actually told me that for bigger amps not to use the factory wires. That's only for bigger amps

hey I really bring to understand exactly which harness I am cutting

I had the same point of confusion before about which of the two harnesses you were disconnecting the speaker leads from. I think it was hard to tell which harness was which. You were designating them as aftermarket and Metra. I have to think of it as Aftermarket and Factory or Stock, or it's a little hard to track. Logically, we have to tie the speaker leads to the "stock" harness to get signal to the existing speakers that are all Molexed up and terrifying! As I am just now going to be installing the whole system, head unit, steering wheel control, parking brake disable, aftermarket amp, I will simply follow the logic of not connecting the speaker leads together in the new harness, just clip and heat-shrink the ones from the aftermarket harness and wire the leads into the stock/factory/Metra harness to get the beautiful noise through the existing wiring. Now for the tricky part (hah!). I was able to eBay a factory sub/amp (which my 2005 Focus was not equipped with, though from all the rumors, the wiring exists. If the harness does not really exist, shall i just run one RCA from one of the sub outs of the AVH 1300NEX to the hatch, clip and strip the RCA cable to provide the input. Then T off the remote on and put an inline step-down to keep the amp from popping? All help welcome. I am learning a TON, and gratetful for your work! Hopefully I will only have to do this once. And keep this car forever!

Thank you for this man, I now feel confident enough in tackling this myself saving some money on labour!

really high quality Thanks

I literally..... dont know still

5:18 i read in a few places the wire stripe means positive. great.

this help me out a bit but wrapping my head around it more now

Thank You For The Video I Just Learned About Something I've Needed To know So I Can Put A System In My Semi Truck, Just To Be Clear On Things I'm Going To Run Speaker Wire From My Amp To The Afermarket Harness ?

i used shrink rap for the first time ... I AM A GOD fun to use and very good stuff

So. 1) Connect the 2 or 4 channel RCA cables from the head-unit to amp. 2) Connect 4 speaker wires, from the amp to the factory harness. 2A) Keep in mind that you have to disconnect the factory harness speaker wires from the Metra harness speaker wires. 2B) You also have to cap (seal) the Metra speaker wires. 2C) Match, then connect the amp speaker wires to the factory harness speaker wires. Connect the other or opposing ends of the speaker wires to the amp. 2D) You’re now “ done “ with the amp to factory speaker wires connection & the head-unit signal to amp connection.

Iam a slow learning dude . You make it simple and fun, and l like that there is no overkill.

Thank you. I saw the clips in the pack and thought this is gonna be annoying to install but good to know I can just chuck them in 👍🏽

So if I’m getting this right say your door speaker connects to the amp by spicing it and connecting it to the prong setup as showing and the RCA cables on the back of the amp connect to the RCAs on the back of the head unit? I think

Okay am I getting this right. I have to cut the speaker wires coming from my doors to my head unit. Connect the wires coming from my head unit to my amp. Leave the speaker wires coming from door speakers snipped. And plug the RCA's in. How do the speakers get power?

Thia was awesome! thank you so much definitely subscribed.

Good stuff guys.

But how much power can the factory speaker wire handle?

Thank you for trying to help me learn, but I leant nothing

Nice work

this what i what I was looking for man. Many thanks and bless ya, Everyone try do reviews about amplifier systems long and boring ones where basically they strip off doors, do drilling and new cables wiring . here is so simple,use your car existing wire management and amplifier. Colours matched as mention on your video . All working perfect . You are the star man...subscribed....

Do you connect the speakers to the factor harness or aftermarket harness?

It’s going to work only on under 50 rms (watts). But if you have 4 speakers over 50 rms (watts) you need to use 14 gauge wire and 18 gauge wire under 50 rms or from factory wire that came from car.

this video just saved me a ass load of time not having to wire from the speakers directly to the amp. i can just use the wires already in my truck and run the wires from the factory type adapter to the amp itself. so much easier than running all new speaker wires to the all especially with the pac connectors on each door.. same that was gonna be a real pain in the ass! thanks so much for showing this easier to do shortcut!

Excellent soldering and insulating tutorial

pliz answer whay dosn'n remote contorl(blue wire) conect to radio

At first I thought he was connecting the speaker wires from the amp to the HU and leaving the wires to the speaker

I love this video it really solved my problem. Thanks, guys

Beautiful! Thanks!!

No, the first thing you need to do is not stand in front of a black background wearing a black tee shirt holding dark/black components. or is it just me.....

Why did u go from the amp to the head unit-side from the amp vS going to the side that goes to the actual speaker

Excellent video which for me it cleared up the question of do i wire the amp speakers directly to the adaptor or do i splice the factory speaker wires into the Aftermarket adaptor and the speaker wires coming from the amp. I now know this would be the wrong way to wire up the speakers. I just wire the amp speakers directly into the aftermarket speaker wires. Connect 2 RCA plugs into the line in plug of the Subwoofer and take that to the back of my aftermarket radio. Connect the blue send wire. Run the power cable from the battery and ground cable near the amp and wallah the install should be finished and now i can turn on the radio for the 1st time! This is my 1st time doing this kind of installation so im pretty excited!

Nice touch

Is there a disadvantage in running one set of rca cables to a 4 channel amp when connecting the front and rears?

You saved your old tape but didn't use it. It probably wasn't worth saving, that second time around usually doesn't stick as good anyways.

Your videos are always clear and detailed and easy to follow. I personally need to know how to connect an amp and LOCto my 2023 compass stereo but I don’t believe I have easy access to my stereo harness, being that it’s a large 10 inch screen(not easily removable). Not sure how easily I can add an amp maybe a dsp to connect to two subs, but also boost my door speakers. Any recommendations? I have a dsp and two amps plus lots of materials from previous car stereo set up, just hoping to integrate some of them on my new car

Clear and precise information. Just one thing... THE MUSIC IS SO F..ED LOUD! 😂

Doesn't matter how many of these types of videos I watch. I continue to learn less and less. No one answers the simple questions that I am looking to have answered.

why do they never show how the wiring goes back to the speakers from the amp? or am i misunderstanding thingS?

Very explanatory video. Top

Of course this help me alot for my 4 chanel amp, When i bought the amp and installation kit yesterday i didn't know where to start so i browse and found this great video and now i know what to do and save me $129.00 at geeksquad so i clear understand how to do this project now than you very much for your great video

If you go down this route how much power can the factory wires handle before you need to re-wire the whole stereo system?

I don't understand how it goes to the speakers from the Amp, to me it seemed like, Amp to wire harness plug back into deck, or did I miss understand something. Your workmanship is great 👍

So since I’m running an amp to my subs and now planning on running a amp for my door speakers do I also go about making a T- connection on the signal wire?

I understand a little now. Thanks fo this video !!!!

So I already have an amplifier, subwoofer and aftermarket head unit, and I want to Install a second 4 channel amp for all four of my door speakers. I have a few questions about wiring it up. 1. Would it be easier to cut the speaker wires from the radio like you did and run them to the amp. 2. Can I use just one pair or RCA cables to send signal to both front and rear? 3. If yes (from question 2) what amp would have the switch for 4 and 2 channels? 4. Can I make a "T" connection into my existing remote wire to send signal to the second amp. 5. Would simply getting a 2 channel amp and bridging the front and rear be simpler since I'd only have to use one RCA? I'm a beginner with this kind of thing so I'm sorry if I'm difficult to understand. I really just want more oomf in my door speakers since they can handle around 100rms according to the box lol

What wires actually go to the speakers? All I've seen you do is connect the hu to the amp.

What would be the best way to install two amps in a Dodge Charger 2017 with a eq

Didn't know I needed this until I seen this

So I watched this a few times over and you wired the radios speaker output to amps speaker output????? The radio speaker output should have been the side that was sealed off

Very confusing you cut soldered 2 wires where is the other one very frustrated learned nothing

Can I run the front left and right speakers to one channel? 2018 4Runner. Adding 2. 10” and an amp 5channel amp 4Runner will have ten total speakers.

Very nice work my friend❤

Everyone knows how to install car audio these days, and everyone have different ideas of how to make a best sound in their cars

"How To Without Cutting Factory Wiring" but the first thing you do is cut into the front speaker wiring. I'm lost. Are you cutting into the harness you created? So how do I make that harness? Ugh.

Took me a couple times to understand. But I get it now. Wasn’t the video just me. Thank you

how can you connect a eq with just rca after you make that connection you made i want to add my eq to that amp for better quality on my highs and mids.

Who the hell has a P touch machine laying around? Looks like I'm gonna have to swipe the one from the office Monday mourning.

do i need to remove wired fuse when installling aftermarket head unit?

Nice connection 👌 I'm from India

Thanks for the video.

hi just asking in subwoofer there are 2positive and 2negative how many connection it should be line will connected.hpe to hear from your advice ty

Great video learnt a lot thanks 🙏🏼

In addition to running speaker wires from the LOC to the car speaker wires, I just realized I ran an additional set on both car speakers and ran them into the speaker terminals on the sub amplifier obviously where the sub speaker wires go into. The sub works and sounds great I just don’t know if there’s any issues to having another set of wires on each side of the car speakers running into the speaker terminals on the sub amplifier

Clear as mud!!