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08-11-2015, 11:39 PM | #1 | |
AF Newbie
Join Date: Mar 2005
Location: Edwall, Washington
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95 TopKick battery drain problem
This truck just had a new alternator installed and replaced the 8 year old batteries. The alternator charges properly.
Because we previously had times when the charged batteries would go dead overnight, I checked the current to ground with the key off. The ammeter immediately read 28 ma. About 20 seconds later it dropped to 18 ma. and then finally settled at around 8 ma. Is this normal? Shouldn't the current drain be zero when the key is off? Is the computer on all the time and draws that amount? I pulled fuses at the fuse block mounted on the firewall and found two 40 amp circuits where the current was going...around 4 ma each. FYI it has a Cat diesel engine. I'm just wondering how long two big 12 volt batteries will hold a charge with 8 mils of current going to ground. Thanks for any ideas.
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08-12-2015, 10:16 AM | #2 | |
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Re: 95 TopKick battery drain problem
8ma is about what the ecm will draw. That shouldn't make a dent on a pair of fully charged group 31 batts in parallel. What other accy's on the truck? Lift gate, refrigeration unit? Lift gate only being used while truck is running?
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08-12-2015, 10:34 AM | #3 | |
AF Enthusiast
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Re: 95 TopKick battery drain problem
Rule of thumb is anything less than 50 ma draw is fine.
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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles- |
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08-12-2015, 11:11 AM | #4 | |
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Re: 95 TopKick battery drain problem
That's some driveway you got there.
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