68 deville Generator light
 

I replaced the alternator since the GEN light kept coming on and would only go off when actually driving(come to a stop and the light comes on, car doesnt die, just comes on). I have been having starting troubles and replaced battery, alternator and starter, but battery wont hold a charge and GEN light is still on. Any ideas whats up?

Check the belt
 

Hi,
How old is the belt?
I had the same problem with an Olds 98. Battery kept draining, power windows were slow etc. Light on at idle, off when driving. I had the ALT tested, it was good. Turns out the belt was slipping at idle (all speeds really). It looked ok and was tight, no noise. But the pully design lets the belt when worn slip at low speeds. The belt slips down into the pully and only the top edges are actually in contact with it. New belt and the problem went away. Hope this helps.

Rcad