Having an issue with my alternator. Generator light, and the alternator isnt charging the battery. Just replaced the battery and the alternator tested good. The fuze in the black fuze box is fine. When I was talking to the guy about the alternator he said it was regulated by the pcm, rather than internally. Could the pcm be not working in that one area rather than in every area. The truck starts and runs fine untill the battery runs out of juice. Any help would be awesome, thanks.

 

Indy,

could this be a side effect of the ground issues you were having?
IIRC, recharging a battery requires you to reverse the current at the negative and postive leads. If you weren't getting a good ground back to the battery, but were grounding elsewhere on the truck, you could concievably power the truck, but not recharge the battery.

 

Yes it is possible for the PCM to fail on just the alternator control circuit.
You should have constant power on one of the small terminals and the PCM controls the ground side on the other on the alternator. It think the power is supplied by the ASD relay.
Make sure the large batt terminal on the alt is conncted to the positive batt terminal and has good continuity.

 

I was having the same sorta problem myself, replaced my batt n was going to replace my alt b/c the guys at Advanced Auto insisted my alt was dead...turns out i just had a bad (-) batt cable...$25 later n the issue was resovled...

 

i d go with squerll on this it got be somthing with the wirein melting ground wires i dont think it saposed to do that.you got a buetyful truck and it deffintly like a woman..you got to get some baggege with the beuty.

 

I'm with you on the ground wires. Seems there is a larger one in the passenger side from the motor to the firewall which is where all the damage was. Not sure it is possible without water temp issues, but might be worth double checking the belt routing.

 

damn indy... when it rains it pours.

 

Anyone know what pin and plug the alternator regulator circut goes through on the pcm?

 

Forget i said anything, i figgured it out, Im a dumbass.

 

Well Indy

What was it??

Jeff