Slow drain on electrical system

Tiny
JESTEP1966
  • MEMBER
  • 2018 JEEP COMPASS
  • 2.4L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 37,000 MILES
Any advice on where to start testing or how?
Thursday, December 3rd, 2020 AT 1:16 PM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I attached a guide for you to follow for testing.

https://www.2carpros.com/articles/car-battery-dead-overnight

You will need to disconnect the negative cable and put a voltmeter in line. Red lead to the cable and black lead to the battery post.

Set your meter to DC amps and let it sit for 10 minutes.. Then check the reading. It should be 50 to 75 milliamps.

If it is more, then pull the fuses one by one until the draw comes down to normal.

Roy
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Thursday, December 3rd, 2020 AT 1:31 PM
Tiny
JESTEP1966
  • MEMBER
  • 9 POSTS
Roy, thank you for your help. Should I also remove relays to check them?
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Wednesday, December 23rd, 2020 AT 9:25 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, just the fuses until the draw drop down to specs.

Let me know which fuse so I can help further.

Roy
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Wednesday, December 23rd, 2020 AT 9:46 AM
Tiny
JESTEP1966
  • MEMBER
  • 9 POSTS
Roy, thanks for your help. Do you mean to hook my multimeter from negative post and negative terminal? And then set meter to 200 mili amps. And also do you know how many volts the stop start battery is supposed to have when I charge the main battery to 12.9v? Thanks
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Saturday, January 2nd, 2021 AT 9:40 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

12.6 volts is a fully charged battery.

Remove the negative cable. Red lead from the meter to the battery post and the black lead to the cable.

Roy
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Saturday, January 2nd, 2021 AT 11:14 AM
Tiny
JESTEP1966
  • MEMBER
  • 9 POSTS
Thanks Roy. Right now I am checking out the ess battery. I have had the main battery on a 4 stage charger since Christmas still in the vehicle. It tests 12.9v. But the stop start battery only tests out 5.8v. Could that battery be draining the main battery?
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Saturday, January 2nd, 2021 AT 11:38 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, it could be trying to maintain a steady voltage. I doubt the battery is any good.

Roy
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Saturday, January 2nd, 2021 AT 11:44 AM
Tiny
JESTEP1966
  • MEMBER
  • 9 POSTS
Thanks a lot. I am putting that battery on charge by itself just to see if it will hold a charge on its own.
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Saturday, January 2nd, 2021 AT 12:10 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like a plan.

Roy
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Saturday, January 2nd, 2021 AT 12:19 PM

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