*Edit for the person viewing this thread in 20 years. Are flying cars as cool as we thought they'd be? Anyway, my problem turned out to be a fried voltage regulator*


Hello all,

I haven't been able to find my issue via search, so here are my symptoms:

-My 1982 300D is charging the battery fine, but while driving the climate control fan ramps up and down erratically (not clicking like normal automatic climate control).
-At night, my headlights also flicker slightly.
-At startup, the battery and brake lights stay illuminated until I give it a little bit of throttle, then they go away.
-I bought one of those cigarette lighter voltmeters and it corresponds with the climate control fan ramping up and down. This confirms that power is surging, and is affected by RPMs (although not mirroring RPMs directly).

About 4k miles ago I had the original alternator rebuilt and replaced the voltage regulator. I just pulled the voltage regulator and it looks fine, no abnormal wear.
My belt is pretty tight and still in good shape.

So here are my theories:
-My Hella voltage regulator is of poor quality and already going bad.
-The alternator is worn out
-the belt is slipping

Thoughts?
Thanks in advance.