Have a 2007 6.0/6l80 with a 2010 GMC e38 computer, swapped into a 1971 Chevy K10. It has the Bosch 125a alternator. In the process of tuning, and having issues with the truck not charging. It slowly head dead as I drive it.
Had the alternator checked and they said it charges at 12.8 volts. The guy who checked it(local Napa was the only place with a testing machine) looked at me with the "deer in the headlight" look when I asked him if a varied input changes the output.. Inconclusive on that one..
There isn't a voltage control unit fitted since its a swap, but I'm not sure what to change the alternator settings to? I've tried two alternators and the main power wiring for the alternator is 6 gauge going to a junction block on the firewall feed from the starter terminal. Everything is soldered and shrink wrapped, so I know there's no lose connections. Commanding the L term in the scanner will cause the volt gauge (Dakota Digital VHX) to slowly rise, but not very much at all. Do I need to wire it to keyed power with a resistor life I've done with others in the past, or hopefully just adjust the calibrations?
I'm sorry but I'm at a different shop with no Wi-Fi right now, so I can't attach a log or file. I've got a file in my most recent thread from a few days ago. Need help to figure this out while the truck charges tonight!
Please help!