Parasitic battery drain

Tiny
M BRADY
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 176,000 MILES
Battery is dead after day or two of not running, sometimes less. Everything gets turned off when I get out. If battery is disconnected between driving Will last 3-4 days. Just checked all fuses in dash and under hood using multi-meter, no luck. Had alternator checked was told it's good, new battery as well. Now what do I do? Got no help from Haynes manual.
Wednesday, May 27th, 2020 AT 12:27 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon,

To check for the drain, try this.

You will need a voltmeter with an amp reading option.

Remove the negative cable and put the red lead from the voltmeter to the negative cable. Then put the black lead on the battery terminal. Set the meter to DC amps and wait about 10 minutes and see what it reads. Tell me what the reading. It needs to be 50-75 milliamps.

Roy
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Wednesday, May 27th, 2020 AT 2:41 PM
Tiny
M BRADY
  • MEMBER
  • 3 POSTS
1.11 after 10 minutes it went to 1.02.
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Wednesday, May 27th, 2020 AT 3:59 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Okay, too much.

Now you need to pull the fuses one by one until the draw drops to the spec I posted.

When that happens let me know the fuse number and I will find what the fuse controls.

Roy
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Wednesday, May 27th, 2020 AT 4:02 PM
Tiny
M BRADY
  • MEMBER
  • 3 POSTS
We did pull fuses and all stayed around 1.02, but will try again when I get home.
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Wednesday, May 27th, 2020 AT 4:06 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Okay, keep me updated so I can continue to help.

Roy
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Wednesday, May 27th, 2020 AT 4:10 PM

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