2010 Kia Optima Battery drain

Tiny
OBINNAA
  • MEMBER
  • 2010 KIA OPTIMA
  • 2.4L
  • 4 CYL
  • MANUAL
My new car battery drains overnight. I have tried removing the fuses one after the other with a test lamp on the negative terminal but found the light permanently bright. I did not however disconnect any of the relays in the fuse box. Please help
Sunday, July 26th, 2015 AT 10:20 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
There are some other guidelines to doing this.

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.
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Sunday, July 26th, 2015 AT 11:13 AM

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