Lights dim as rpm goes up? Options

[koozy]

What the heck? I never drove my car at night until tonight. I get in and start the car. Drive down the street and notice the lights are kind of dim but not too bad. I step on the clutch and when the rpms go down to idle the lights get brighter. So I pull over and check it out. The lights dim as I increase rpm and when I let go of the gas and come to idle.... 3 seconds or so after it's at idle they get brighter. I've seen the opposite happen but never this. What could be happening?

[geniusanthony]

It sounds like your alt. is not charging. If you recently pulled the motor like I did once and did not plug the harness back in to the relay board, there should be a red light on your fuel/combo gauge with engine off and key in the run position for at least a few seconds. Another check for your charging system is battery voltage w/ engine off vs. engine running....,i.e., ~12v.- ~14+. After those checks, do you have high power driving lights or high wattage bulbs but that shouldn't affect this.

Good luck, been there.