Join Date: Jul 2012
Location: AJ, AZ
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Provided the glow plugs are off, you should be measuring at least 14 volts at the batteries when the engine is running. With my headlights and AC on, I get 14.6 volts at idle, but I have also upgraded my alternator.
Try checking the output voltage at the terminal on the back side of the alternator with one probe on the terminal and one on a good ground to get an idea of what your alternator output is; however, make sure that you wait long enough for the glow plugs to shut off, as they draw a lot of current.
2000 F350 4X4 CCSB w/ 7.3 and 4R100
PIS 175/80, Adrenaline HPOP, 4" Exhaust, 6637 Filter, CCV Mod, Leveled Front, 315/75/16 Goodyear Duratracs