wiring check

Is this a "factory like" harness? Is the ammeter still wired up? If so, observe if it deflects with the headlights.

This is the m&h harness from year one supposedly factory repro. The ammeter does deflect when I turn headlights on

If that is so, not sure. As above, fuses?

Checked fuses all good.

What do you have the battery grounded to?

Currently to the radiator support, maybe should go to frame rail?