Parasitic draw
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7th Gear
Joined: Sep 2022
Posts: 7
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From: CA
Parasitic draw
So I'm currently doing a parasitic draw test on my C5, I'm doing the regular pull negative cable removal method where I take out the negative cable and put the positive lead to the negative cable and the negative lead to the negative post and I see and amp draw of 1.35-1.29 but then all of a sudden it drops to .80~.70 and then finally down to .20 I never really expected this to happen, but does anyone have a clue on what happened? Could it be something specific as to why it dropped ? I'm completely clueless, I need help! Something that just happened recently is that my right headlight motor gear broke I'm not sure if maybe that could be the drain ?
*UPDATE*
so about 9 days later I finally found out what was causing the drain it turns out it was the horn, i unplugged the horn fuse relay and boom it stopped draining and the amps went down from 0.13 to 0.02, thanks to all the people that helped out!
*UPDATE*
so about 9 days later I finally found out what was causing the drain it turns out it was the horn, i unplugged the horn fuse relay and boom it stopped draining and the amps went down from 0.13 to 0.02, thanks to all the people that helped out!
Last edited by Jpartida; Oct 7, 2022 at 08:26 PM.
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Joined: Sep 2022
Posts: 57
Likes: 17
From: Oregon
That's what happens as the car falls asleep. 0.20 amps is still pretty high, I think .085 or less is normal but I'm not that great with electronics. If you meant 0.02 then you're car is fine.
Last edited by Endless Money Pits; Sep 28, 2022 at 03:05 PM.
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From: Cape Coral, Florida
So I'm currently doing a parasitic draw test on my C5, I'm doing the regular pull negative cable removal method where I take out the negative cable and put the positive lead to the negative cable and the negative lead to the negative post and I see and amp draw of 1.35-1.29 but then all of a sudden it drops to .80~.70 and then finally down to .20 I never really expected this to happen, but does anyone have a clue on what happened? Could it be something specific as to why it dropped ? I'm completely clueless, I need help! Something that just happened recently is that my right headlight motor gear broke I'm not sure if maybe that could be the drain ?
.02 amps which is 20 milliamps is good after the cars modules “go to sleep” !!
Thread Starter
7th Gear
Joined: Sep 2022
Posts: 7
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From: CA
Melting Slicks
Joined: Sep 2008
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From: Espanola New Mexico
Yes that's way to high, suggest disconnecting your battery power cables at the engine fuse box, and the alternator output cable and then measuring sleep mode current. Connect the alternator output cable first, and check your current reading, then add either the engine bay fuse box or interior fuse box to determine which one has the excessive current drain.
Thread Starter
7th Gear
Joined: Sep 2022
Posts: 7
Likes: 0
From: CA
Yes that's way to high, suggest disconnecting your battery power cables at the engine fuse box, and the alternator output cable and then measuring sleep mode current. Connect the alternator output cable first, and check your current reading, then add either the engine bay fuse box or interior fuse box to determine which one has the excessive current drain.
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