I have been working through charging issues for a while. I had both alternators rebuilt. A few months back I noticed my volt meter down a bit from where it normally is. I sent it back to the shop that rebuilt it (Gen1) and they said the regulator went bad. They swapped it out and said everything is fine now.
I am not convinced. I believe my volt meter used to sit squarely in the middle of the white tick mark in the middle of the green zone no matter what. Now after start up and stabilization it sits on the left side of the white tick in the green. Still ok, maybe?
when I load up the system; headlights, max vent fan, aux cooling fan, voltage needle moves out of white tick toward yellow zone, no longer touching the white tick mark and half way between the white mid mark in the green and yellow. (1/4 way down in green zone).
This truck does not have much of the typical aged rusting and corrosion as some of these vehicles do. With both alternators rebuilt, extra ground wires, etc I would not expect twin 100A alternators not to be able to keep up.
I have checked the voltage output on both alternators unloaded and loaded.
Gen 1 unloaded 14.3V, Loaded 13.6V
Gen 2 unloaded 28.2V, Loaded 27.1V
I know these are in the acceptable range but certainly doesn't make me feel comfortable that something still is not perfect with these alternators.
Can someone give me your thoughts? How does your voltmeter read when you load up the system? What kind of voltage readings do you get when you load up the system. Does it stay perfectly centered no matter what the load? I don't feel that I am putting any load out of the ordinary on the system. Gee Whiz this supposed to be a command and control vehicle and have tons of comm equipment. I suspect that if I did mount some off road ligths, major comm gear or other loads the system would not be able to keep up the way it is acting now.
I would not expect Gen 1 Voltage to drop that low after I have added load. If anything I would expect it to drop and then come back up to at least the 14.3V.
Your opinions would be very appreciated. Should I pull both alternators off and have them both checked? Wish I could find a better alternator guy but I am already in for two alternator rebuilds with this guy!