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Old 02-08-2018, 01:01 AM   #1
Gregs71
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Join Date: Nov 2006
Location: Nor Cal.
Posts: 226
Battery draw / drain

Hi, i have a 2003 Tahoe. The battery is two years old and recently started going dead after sitting for a day or two. I checked the draw on the battery by disconnecting the neg cable an putting the leads on the negative cable and neg post. The reading starts at 5.xx. After 10 or 30 seconds it drops to 2.xx. it then drops to about 0.9 and then goes to 0.00. After going to 0.00 it starts jumping around to 0.9 back to 0.00 then to 2.23, etc. It bounces around in various intervals and to different numbers. My understanding is it should sit at about 0.03...
Tried wiggling pos and neg cables, engine block ground while numbers fluctuated th no noticeable reactions to the fluxuating #s... thanks in advance for suggestions.
Greg
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1995 GMC 4x4 1/2 ton
1999 Jeep Wrangler w/ 33's
68 camaro 350/350
1987 Chevy 3/4 ton 4x4
Suzuki DRZ 400s Dual Sport
1971 chevy long bed 2x4
194? Dodge 2.5 ton
1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455
1989 Chevy V30 crewcab dually 454/TH400
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Old 02-08-2018, 10:04 AM   #2
retrax
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Join Date: Oct 2017
Location: St. Paul, MN
Posts: 42
Re: Battery draw / drain

It could be a faulty module waking back up. This can be frustrating but what I would do is pull every relay and fuse. Slowly plug them in one at a time until the problem starts back up again. At least then you can figure out what circuit it is on. I guess a better way would be to watch your meter and start to unplug relays and fuses to see when the draw stops.
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Old 02-09-2018, 01:28 AM   #3
Gregs71
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Join Date: Nov 2006
Location: Nor Cal.
Posts: 226
Re: Battery draw / drain

I tried that the other day pulling the common fuses like rhe radio door locks, windows etc. I might have to try it with every fuse i guess...
__________________
1995 GMC 4x4 1/2 ton
1999 Jeep Wrangler w/ 33's
68 camaro 350/350
1987 Chevy 3/4 ton 4x4
Suzuki DRZ 400s Dual Sport
1971 chevy long bed 2x4
194? Dodge 2.5 ton
1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455
1989 Chevy V30 crewcab dually 454/TH400
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Old 06-19-2018, 01:26 AM   #4
Fullpower
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Join Date: Nov 2010
Location: Homer, AK
Posts: 57
Re: Battery draw / drain

If the truck has been in water, or had a fair bit of salt water dripped on the seat ( fisherman, surfer, etc..) there is likely horrible corrosion at airbag control module ,connector under driver seat.. Those will pull power, intermittent.
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