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AL82 Alternator fault

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novasmic Officially Full-On Dubber

251 posts · joined Oct 2012 ·

#980453
Hi guys, I have an AL82 12v internal regulated alternator, the 12v feed through the idiot light is fine. When you start the car up the light goes out but not putting out any charge?

I pulled the brushers out and tested omhs resistance over the 2 slip rings and got 2.9. anyone know what this should read or any other tests i can do on it.

AA003 Custom Title Time!

1,189 posts · joined Oct 2011 ·

#980457
The rotor very rarely fails so 2.9 ohms sounds OK.

It's usually the diodes or regulator that go.

It could be a power diode defective.
I read it on samba, so it must be correct.

Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!😂

novasmic Officially Full-On Dubber

251 posts · joined Oct 2012 ·

#980461
Thanks for the info, any idea once I remove how to test these items?

novasmic Officially Full-On Dubber

251 posts · joined Oct 2012 ·

#980482
Also, anyone know where i can buy a diode pack or reg for this alternator?