Weird Electrical Problems

[79brownbetty]

I have a '79 camaro. A couple of days ago I noticed that my headlights were getting dim. When I checked my voltage gauge, it was almost in the red. I thought that my alternator had died, so I replaced it. However, this did not fix the problem. I replaced the battery, but the problem persist. The weird thing is that as long as the car is in park, the voltage gauge will read around a 12, but as soon as I put it into drive it drops to the red (with or without the headlights on). What's up? Does anyone know?

[stone_mound_camaro]

I think you may have just bought a brand new bad alternator..... It happens

[97cavalier]

did you replace the volt regulator also?

[wrightz28]

How's the belt tension? Sounds liks the alternator isn't being turned at the correct speed. No other 'odd' noises from the other pulleys?

[79brownbetty]

That idea crossed my mind this evening. I don't have any belt noises, but that doesn't necessarily mean anything. I'll check it out. Thanks.