Thread: Need some expert advice

the most you should see out of the alt is 15 volts you might have another bad one.

from my own experiences, cars don't like to have a charge over 14, a high 13 is even better, its like the computers cant function with that much power.

my last truck i went through 3 alts in 3 days, all over charging, truck didn't run right at all, and had the low volt light on the whole time, all tested good at the store, this was autozone to, so if that's where you got yours i feel your pain.

I'd need an fsm in front of me. But the system voltage can be raised by inserting a diode etc into the S or sense wire on teh altenrnator. Typically this wire is fed igntion voltage and that's how the regulator in the alt knows what it's putting out to the system. It's possible that the wire is seeing some resistance the the regulator believes it needs to ramp up the voltage.