big_country_001

Look no one in the 1st gen form can help me ive done everything i can with the truck, 2 new altornators, put on the external voltage regulator, checked all the wiring and grounds , and i cant figure out why the altornator is not turning on to charge, everything reads 12.61 volts when the battery is charged but if i turn any power on it just drans the battery

93stacks

i just went through this like for the past 3 weeks, figured out yesterday that the asd relay was bad. and some how the starter relay went bad. so just to see if it helps ya go buy 2, 5 pin relay's and replace them both and see if she charges.

big_country_001

Nop that did not help

Sur5er

I know you said you checked all the wiring, but.........try jumping 12VDC from the battery to the alternator field wire. If the alt doesn't see power, it can't generate voltage!

big_country_001

Its geting 12 volts to ll the wires on the altornator

wannadiesel

Well, that's a problem. You should only have 12 volts on the big stud and one of the little studs. The third stud goes to the regulator. If you ground that stud, you should get about 20 volts out of the alternator.

big_country_001

Well i hooked the external voltage regulator up following the instructions on the 1st gen sticky form, and thats how they said hook it up. how should it be hooked up then

wannadiesel

I don't think I can make it any clearer than that diagram. If it's really hooked up like the diagram and the regulator case is screwed to a good ground, then the alternator will charge. Perhaps you are not the best person to work on your truck?

Onemoparnut

There are 3 posts on the back of the alt two smaller ones and one big one. The big one should have 12v and then another wire should come from a 12v supply and go to the top terminal on the voltage regulator. Then that same wire will continue to one of the small terminals on the alternator. The other small post on the alternator should be connected to the only empty terminal left on the voltage regulator. If you have it wired correctly and there is voltage everywhere there is supposed to be and the voltage regulator is grounded then you either have a bad alt or reg.

big_country_001

Ok thanks its hooked up like that and ive had 2 diffrent brand new altornaotors put on it, so idk then/ see i had it tested at autozone, i realy dont truck there knowledge but they wont let me use there tools so is it posible that its charging and ther tester is not working properly, wen i drive the truck its fine but when i turn the heater fan on the battery guage will drop to the last notch, with it off its only on the second from last notch on the left of the guage?

Onemoparnut

try supplying voltage to the large terminal and one of the smaller terminals at the same time. Then ground the second small terminal it should charge like crazy if the alt is good just don't do it for long just a second or two.

Onemoparnut

Did you ever get this fixed???

big_country_001

Ya i fanily did, it ended up being the brand new voltage regulator i bought from autozone was bad, thanks for all the help

Onemoparnut

No problem glad you got it fixed.