As Art suspected it could, and it has, my charging problem is back! Makes sense since I never found the cause, it had just started working normally.

Currently, with key on and engine not started, The cluster idiot lamps all glow normal brightness. When engine starts, the battery, parking, brake failure, and bulb failure all glow dimly and voltage from the alternator is below normal battery voltage.

If I connect from D+ wire through 12v test bulb to D+ terminal on alternator, the bulb doesn't glow. When I test current through this same test circuit, it's pulling only 120mA.

If I connect the 12v bulb from B+ to D+, the bulb glows until I start the engine, then the alternator charges normally. If I disconnect the D+ wire after a few seconds, the alternator continues to charge normally.

I have removed every ground connection in the engine bay, cleaned and tightened. They actually all looked shiny and clean already. (This car has never seen snow).

I assume my problem is still in the cluster. I traced everything and checked all points for resistance last time. Ideas as how to proceed?

Thanks so much!