1 volt drop???

[Wynndiesel]

I had this happen with my 04 envoy. The alt is regulated internally by itself so its not like the newer vehicles where the ecu controls my voltage output on the alt. The problem mine had is that the ground from my battery to the engine and frame was getting rusty. Everytime i cleaned it up, my voltage would come back up to 14.9v warm but when it got a little bit of rust, it would start to drop back down at 13v. I also noticed a random "dancing" affect of my volt meter in my dash when i first started my truck up. The voltage would go up to 14.4v but drop to 13, go up, back down, and then stay steady. As soon as i fixed the ground it worked fine. I would just double check your positive and ground wires in your engine to make sure they have no corrosion or rust on them and go from there.

Mine was extremely sensitive to rust and would screw up my charging system a ton with it.

all connections tight no rust

[kickass audio]

Hmmm it may be your computer regulating your voltage or maybe the alt has a bad diode but i doubt that. Maybe contact dc or mechman to see what they think it would be but im thinking it is either your ecu that is restricting your voltage or your alt may have a bad diode but im not a guy who builds alts so dont quote me on it

[mrd6]

seems pretty likelty its just the weather...i have a stock alt still but mine does the same thing. I live in seatte so same summer temps around 80 and winter say around 40. In winter i charge at 14.8 cold and drop to maybe 14.6 warm. Right now when its hot outside im charging around 13.8 warm. Almost a whole volt drop so what you are describing doesnt seem that unreasonable

[skittlesRgood]

i really doubt its the weather... lake tahoe is always a little colder than here in the bay area. i have the same alt and i dont see any difference in voltage as the weather is warming up. just call up DC on monday. they are very helpful and they will know the answer. plus im sure the alt is under warranty so you will be covered.