Ok I own an 89 buick park avenue and I recently noticed that the voltage gauge in the dash, along with the headlights, would fluctuate. I tends to do it more at idle than on the highway although it still does it a bit while driving. Also, the blinkers will cause quite a large drop of voltage. If, at Idle, I disconnect the positive terminal on the battery, the car dies. If the throttle is held down a little bit and I disconnect the battery, it will keep running.
Sounds to me like a diode is open and the alt. Is only putting out 2/3 of it's potential so I had the alternator tested at a shop and according to them, it is functioning correctly. I have also tested the battery connections.
Any help will be greatly appreciated.
have the same problem?
Thursday, July 23rd, 2009 AT 4:14 PM