Compression Ignition Addict
Join Date: Dec 2006
Location: Orange Beach, AL
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Well, back to the drawing board, I think. I took a piece of ground wire (the heavy type you use on a home) and ran it from the Neg post to one of the coil springs, and touching the body as well. NO change; right is charging @14.12 and left still at 12.43V.
Next I ran the wire from Right Pos to Left Pos. Clamped them, protected the engine compartment in case something came loose, and started the truck. I really expected to see charging voltage the same on both batteries this time. NO change.
First, by-passing first the ground strap and then the Pos cross-battery lead changed nothing.
Second, changing out the batteries did nothing.
Third, static voltage on the batteries is 12.62, and while running we're seeing 14+V on the right side battery, so we assume that the alternator works fine, can't we?
If it isn't alternator, isn't batteries, then was my testing with the ground wire enough? It didn't make .02 bits of difference in voltages. Installing new cables is an option, but let's figure out what I've missed, because right now I'm not convinced that the battery cables are the problem.
Just not getting charging voltage to the left-side battery.
2000 F350 7.3 PSD
6" suspension lift
4" cat-back exhaust
air filter mod