How to do a quick and dirty alternator diode test with a multimeter

Рет қаралды 194,648

Жыл бұрын

I'm no electrician so I could be completely wrong about this. Lol Let me know.
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Пікірлер: 67

@MiniH0p Жыл бұрын

pov ur waiting for him to say what setting on the dvom. typical youtube mechanic guide

@gearheadautosolutions 9 ай бұрын

the diode mode if u cant find it then this aint for u bud

@skitbra1261 8 ай бұрын

@@gearheadautosolutionsyou know its a tutorial, with that attitude how do you learn anything? Bad mentality.

@Not_Sure_ 7 ай бұрын

This model of a DVOM has a diod test setting at the bottom of the selection about the 5:25 clock pointer. The diod symbol. It looks like an odd blue arrow symbol. And like the other commenter had mentioned it . . . if you didn't already know that, you're in the deep end of the pool.

@gearheadautosolutions 7 ай бұрын

@@skitbra1261 yeah on how to test an alternator not how to use a multimeter. Now stfu and mind your business.

@stanza77 4 ай бұрын

It’s a tutorial, teaching you how to do it yourself is the point, bud.

@jerryking8877 6 ай бұрын

With the multimeter set for the diode test (the black triangle with a line through it) and the black lead on the positive 12v post and the red lead on the casing you want to see a reading of 5, but anywhere between 4 to 6 is good. If you get a reading of 3 that is bad. A reading of 7 is also bad. 8 is totally fukt. When he reverses the leads he shouldn't read all zeros, that denotes a resistance free circuit connection, which would be a disaster for your alternator. What he should have demonstrated should have produced a reading of O.L. (meaning Over Limit, or more precisely No Circuit at all) which means that the diodes in the alternator's bridge rectifier are doing their job and preventing current from flowing backwards into the alternator from the battery, especially when the ignition is shut off, because the electromagnetic field created by that system will flash into your car's electrical system when the car is shut off which would be just as catastrophic if not more so.

@bigbadboogie6842 14 күн бұрын

I get 0mV both ways. Charing started getting bad below 2000 rpm and sounded like cwr was super charged from inside of car. 2 days later battery dropped to 6v and car stopped imediatelly. Charged battery but was immediately drained once connected (tested new battery as well). Somehow seems the alternatoeör shorts everything out. Changing to brand new one now hoping its only that

@pb8582 5 күн бұрын

I got a reading of 938 so mine is totally gone 😅

@fleshgear211 3 ай бұрын

Would have been nice to know what to set your multi meter to

@davidpresas8877 Жыл бұрын

You're an amazing person Kakika'y! ❤

@VINNYMOR Жыл бұрын

My mu;ti meter gives a blank screen when in the "OFF" position.

@poemnel13 6 ай бұрын

Mmmm how do you check ohms or if a fuse or cable is bad ?

@onesikm3 2 ай бұрын

I see what you did there you sly devil you lol 🤭😂🫵🏼this for all you dummies who shouldn’t be meddling with things that can get you or your passengers seriously hurt or worse.Leave now before you fry your brain out trying to still figure out what mode he has the dmm set too

@bernardaflores1720 Жыл бұрын

Learn something simple and new today. Going to subscribe

@Not_Sure_ 7 ай бұрын

This is not for the beginner electrician, he is 2 steps ahead of the most of the DIYers. I see there are alot of people here that are new to the whole in depth DVOM and diagnostics of an alternator. I understood wbat he's talking about, and i double checked his work. He gets 2 thumbs up. 👍👍

@tyebolger7625 Ай бұрын

Takes 10 mins to learn😂 youre not special

@dewilliams2012 11 ай бұрын

Its not just diode pack. Its a rectifier, they are arranged in a way where AC voltage in converted into DC voltage.

@jaderamos46 Жыл бұрын

WTF IS THERE A PART 2

@dianarodriguez465 Жыл бұрын

Lol

@dr.z3426 Жыл бұрын

Show what you turned the Meter to Jesus christ man you didn't even turn it on

@coryc5545 4 ай бұрын

Is that just continuity

@smartdummy5751 Жыл бұрын

So when testing with a multimeter, the return value (the number you see in the multimeter) is picked up by the black lead?

@myviews469 9 ай бұрын

If I put voltage on one of those wire the other wire should also read some voltage and if o don’t the alternator is bad?

@LJWalter78 4 ай бұрын

Checking resistance in Ohms correct?

@avery214j 4 ай бұрын

Hi. Respectfully you could show folks the settings your using & be way more clear visually. Its like your talking to yourself.

@YAMAHA_FAN_BOi_95 6 ай бұрын

Sir my alternator is showing nothing on continuity what does that means

@bigbadboogie6842 14 күн бұрын

10 WHAT 😂

@VINNYMOR Жыл бұрын

I suspect you put meter in Diode setting but did not advise in your video.

@smartdummy5751 Жыл бұрын

Is the voltmeter set to 10a DC?

@jamesbomar3903 3 ай бұрын

What mode is the meter in? I didnt see you turn it on.

@cornell833 Ай бұрын

I wonder also

@myviews469 8 ай бұрын

has the meter off is this guy insane

@saturatedfatyt 8 ай бұрын

Im getting a reading of 875 is that normal?

@necrobusher 6 ай бұрын

5 to 8 what? Volts ohms?

@russforg Жыл бұрын

Where is the meter switch on am seeing it off

@smartdummy5751 Жыл бұрын

Im thinking of how the multimeter picks up the current of the alternator in terms of polarity. Basically you need power and ground for it to calculate a value. So in this case, the black lead is input and the red lead is output.

@izellconley5469 Жыл бұрын

What do you turn them. Meter to too test.?

@TheBluetoo99 Жыл бұрын

10 ohms minimum as you need to get a reading of 10 ohms

@zamz7978 Жыл бұрын

I just came back and forth from your video and other video the other video has the black lead on the casing as the proper way to test. which one of you is correct?

@whiskey_tango_alpha_foxtrot Жыл бұрын

If you watch/understand the entire video, he does both.

@whiskey_tango_alpha_foxtrot Жыл бұрын

At that point, the test is not simply for voltage (or resistance) but also the direction of current.

@kimroyful 2 күн бұрын

Can't see nothing

@joaquinmartinezjr813 Ай бұрын

Is this the end all be all to confirm bad alternator?

@HSZGarage Ай бұрын

Unfortunately no I don't think so. Since this video a few years ago I've still been running this same alternator in the truck. Lol it may not have all its diodes functioning but it's hanging in there.

@joaquinmartinezjr813 Ай бұрын

@@HSZGarage lol right. My diodes "checked out" but fail in other tests.

@myviews469 9 ай бұрын

you should get a reading either way

@ChrisMichaelsChicago 6 ай бұрын

Current can only flow in one direction on a good diode, and the meter sends current, so if you have a reading both ways on both ways, it's a bad diode. However in this example, I believe he confirmed there's a connection to ground where there shouldn't be. The circuit wants the engine ground to be the only path. Make sense?

@exploringgodscountry 5 ай бұрын

10 what? amps? volts? alternating? or DC?

@Bowhunterohio 5 ай бұрын

Put your meter on diode. It’s like a colored in arrow pointing to the right with a line through the back. It’s hard to explain so Look up how to set meter to diode on google or KZfaq. He didn’t do a good job explaining that. lol.

@exploringgodscountry 5 ай бұрын

@@Bowhunterohioah okay, that makes more since. Thanks!

@abimariavargas7086 8 ай бұрын

This only tests half the diodes to fully check it u need to remove diode pack...if u were getting good reading with this test

@ChrisMichaelsChicago 6 ай бұрын

If it's a customer, He'd install a new one. But I agree. He's confirmed short to gnd, but where is it? I'd have a look at the rectifier pcb

@jchuck8601 Жыл бұрын

Does it mean the alternator is bad ?

@gunzafterwork1044 Жыл бұрын

Means the coil is touching the case. Ground fault.

@nuckleberryfinn 3 ай бұрын

POS on casing. NEG on alternator positive post. Diode mode shows “0.970” Swapping leads shows “OL” So does that mean in my case current flowing in proper direction but 0.970 seems off, correct? What does that mean for me?

@nuckleberryfinn 3 ай бұрын

Also, thank you

@huntereakright8988 8 ай бұрын

when POS on casing and NEG on positive terminal im reading about 0.360 (pardon me if the decimal place is wrong, im reading what my multimeter says verbatim) im on the DIODE MODE on my multimeter, the symbol of which is an arrow with a vertical line touching ⏭️which just so happens to be the "2k" [ohms??] setting

@davidjensen266 8 ай бұрын

Ohms...hes sending a slight current in one direction to test a one way diode...most people who own a multi meter know how to use it...this guy is not here to teach guys beginning level hes here to teach intermediate guys who read instruction booklet included with multi meter not diy guy who doesnt have a clue and wants to learn but calls everyone stupid because hes watching wrong viddy....js