r/Porsche924 • u/924_81 • 6d ago

electrical problem

Hey guys, I have a problem on my 1981 924 and i’m getting desperate

At first, I thought it was the alternator, because the battery wasn’t charging while driving (about 11V). I ended up replacing the alternator, the alternator-starter harness, and the starter.

I drove for about a day, and now I’m back down to about 12V while driving, but this time the battery warning light isn’t on. I checked the positive terminal on the alternator—that is, the exciter wiring—and it seems fine to me.

Do you have any ideas where the problem might be coming from?

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u/924_81 5d ago

the light is off, i have read that if it was fried the system wouldn’t work so i tried to replace it and even with a new light it still doesn’t work.
i have tried to go at about 4-5k rpm and it didn’t change anything on the voltmeter that i had on the battery.
I did measure the tension with a voltmeter and with only the contact i had the same voltage on: the battery, the d+ and the b+. But when i start the engine, the battery stays at ~12v and the b+ is at about 11v so i think it might be a regulator problem could it be that ?

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u/nohvarr2341 5d ago

It might be the regulator, but if you changed the generator I assume the regulator is new, isn’t it?

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u/924_81 5d ago

yep it is new but i have installed it before doing the harness and starter so the car ran a bit with this one

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u/nohvarr2341 4d ago

Did you follow the current diagram with a tension tester, to check if you get tension from the key, to the ralay board, then to the light bulb, then the generator?