Draining the battery

Tiny
RUSTY1945
  • MEMBER
  • 2002 NISSAN SERENA
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
My battery is drained over night. I have used a amp meter to test it and when I first connect it to the battery it shows fifteen amps draw then goes down to 1 amp. I have no idea what is using this power any ideas. It all started after heavy rain if that is any help.

Thanks,
Russ
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Sunday, March 5th, 2017 AT 9:45 PM

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Tiny
WRENCHTECH
  • EXPERT
There is a procedure for finding a battery draw like that.

You will need a digital ammeter capable of reading in milliamps 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 thirty to forty minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50 ma 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.
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Monday, March 6th, 2017 AT 5:25 AM

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