98 Cadillac Seville STS
104,000 miles.
Just given this car by a family member but has a couple of issues. Battery is dying due to a drain somewhere in the car. Family member had car in shop, and shop ended up putting a disconnect switch at battery because they couldn't fix the problem.
I charged the battery to 12.8 volts on meter, and let the car sit with key off for the day. By the evening, the voltage was down to 9.5 volts. Putting my current meter in series with battery and key off, I was getting up to a 9 amp drain! The current would fluctuate from 0.8 to 9 amps randomly.
Pulling fuses and relays one at a time I would lose the current drain, but when reinstalling the fuses/relays, I wouldn't immediately get the current drain back. It would take up to a minute before the drain came back.
I have an OBDII code reader, and no codes are coming up.
I have the service manuals, but not much information on stalling or drain. Manuals show the parasitic current drains for individual components, but all are in the mA range, not amps.
Family member says battery is about a year old. I have disconnected the factory stereo amp and pulled the cigarette lighter fuses,
but no change. The alternator output is 14.6 volts, and will run the car with battery off with no problem.
Also, have an intermittent stalling problem when car is stopped at light or traffic jam. Car will start back up with no problem. Have checked intake filters, etc. Thanks for any help on this.
~john
104,000 miles.
Just given this car by a family member but has a couple of issues. Battery is dying due to a drain somewhere in the car. Family member had car in shop, and shop ended up putting a disconnect switch at battery because they couldn't fix the problem.
I charged the battery to 12.8 volts on meter, and let the car sit with key off for the day. By the evening, the voltage was down to 9.5 volts. Putting my current meter in series with battery and key off, I was getting up to a 9 amp drain! The current would fluctuate from 0.8 to 9 amps randomly.
Pulling fuses and relays one at a time I would lose the current drain, but when reinstalling the fuses/relays, I wouldn't immediately get the current drain back. It would take up to a minute before the drain came back.
I have an OBDII code reader, and no codes are coming up.
I have the service manuals, but not much information on stalling or drain. Manuals show the parasitic current drains for individual components, but all are in the mA range, not amps.
Family member says battery is about a year old. I have disconnected the factory stereo amp and pulled the cigarette lighter fuses,
but no change. The alternator output is 14.6 volts, and will run the car with battery off with no problem.
Also, have an intermittent stalling problem when car is stopped at light or traffic jam. Car will start back up with no problem. Have checked intake filters, etc. Thanks for any help on this.
~john