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So here is the problem, my alternator which is a usa industries alternator a2075 looked like it ran with 1 wire pretty much the whole time until recently it went bad, i bought a new alternator for a vg30e from rock autos to replace mine, it is an excel automotives but one i installed and hooked everything up. it failed to charge. the wires look like a mess and i am not sure why this is happening. could anyone help?
I know you bought the VG30 alt, but what engine do you actually have? How did you determine the new one isn't charging? Did you test either the old or new at a parts store?
Run new wires from the alt to the battery, ideally w a fusable link. A nice thick wire from the positive lead to the battery and a ground going from alt to battery tray and then to the battery's neg terminal. I've done this and my alternator problems vanished.
Try doing the big 3 aka 3 bigger wires
One. Goes from positive batt to pos alt
Second one is neg batt to chassis
Third motor to chassis
Then lmk how it goes
You can even add a neg alt to chassis