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OT 1994 Buick Century Question

J

John B.

Well-known Member
My mother in law wants to cell her 94 Buick Century. The battery keeps going dead it's only 11 months old and the digital clock on the radio stays lit until the battery is dead. Can any one tell me what to look for?
I take the radio fuse out and the clock stays on. Any suggestions what could be draining the battery?

Thanks for any advice.
 
My first thoughts for a battery drain points to bad diodes in the alternator, but that should not cause the clock issue..
 
Hi John, my wife had a 92 Olds with digital dash and the digital clock display was connected to the other instrument lights. It had a sensor that would dim the instrument lights at night. The clock always had power on it but the display would turn on/off with ignition switch. I agree with other post about alternator diode shorted. GM replaced about three alternators on my wife's Olds under warranty and when warranty ran out parts store suggested I replaced the Delco alternator with a Bosch and it lasted the life of the car.

JimB
 
Start by pulling the regulator connector at the alternator and disconnecting the output wire (insulate it so it doesn't get into trouble). See if the battery still goes dead.
 
Pull neg.cable ...put test light between neg.cable and neg of batt cable if test light is lit ( and it should be) start pulling fuses one at a time till test light goes out ...then test that circuit for a fault ....something grounded that shouldnt be...a switch that shut off completly....bad relay stuck on ...??? Let us know what you find ???
 
If the radio clock is the only thing staying on, the problem is in the radio. I have seen a few of those type radios where the display gets stuck on due to some internal fault.
 
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