I'm working on a '72 D-100 with a charging problem.

The thick black wire from the alternator was grounding out against the valve cover, so I patched in a new wire and installed a new voltage regulator.

All connections on the bulk-head connector look good.

Even though the alternator tested good, the gauge does not work and the battery still does not charge.

What else should I check? Can a bad gauge cause a charging problem?