Battery

1990 OLDSMOBILE NINETY-EIGHT REGENCY
160,000 MILES • 6 CYL
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NALA1369
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  • 1 POST
My battery is being drained almost every night. We make sure not to leave anything on, yet it's dead the next day.
The battery is new. The alternator is also new.
Mar 5, 2016 at 5:19 PM
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CATAFINA
  • ASE Certified Mechanic
  • 167 POSTS
  • ASE Certified Mechanic
You have short circuit somewhere that's draining the battery

https://www.2carpros.com/articles/car-battery-dead-overnight
Mar 5, 2016 at 7:21 PM
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WRENCHTECH
  • ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter, anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.

Mar 6, 2016 at 5:46 AM
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