2000 Corvette Parasitic Draw
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Cruising
Joined: Feb 2025
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2000 Corvette Parasitic Draw
Hello all, I have a base 2000 Corvette, and I am currently having an issue with a parasitic draw. I did a drop voltage test twice, and from what I have saw, the battery has about 160 milliamp draw. When I check the voltage on the engine bay fuse box, I get about a 108 milliamps on the left headlight motor, and 67 milliamps on the right side. After I unplug those fuses to test and see if the amp draw went away, it seems that it hasn't and I now get an amp draw from fuse #25 in the interior fuse box. I check the volt drop on that and the BCM seems to be drawing about 81-108 milliamps. Any help on how to find the problem with this draw would be appreciated!
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Joined: Sep 2013
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From: Cape Coral, Florida
Now how exactly did you figure out you have a current draw on both motors ??...fuse 25 feeds the IPC and BCM...you can disconnect each one of the 3 BCM connectors one at a time and narrow down your search.
Last edited by C5 Diag; Feb 23, 2025 at 11:01 AM.
Thread Starter
Cruising
Joined: Feb 2025
Posts: 10
Likes: 1
I redid the test today and noticed that when I kept the headlamp motor fuses in, but disconnected the #25 fuse, the amp draw pretty much just went away. It went from about 160 milliamps to around 60 milliamps. What should be my next step? Should I remove the BCM to check for corrosion?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
I redid the test today and noticed that when I kept the headlamp motor fuses in, but disconnected the #25 fuse, the amp draw pretty much just went away. It went from about 160 milliamps to around 60 milliamps. What should be my next step? Should I remove the BCM to check for corrosion?
Corrosion is not going to cause a drain !!…60 mA is still high.
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Thread Starter
Cruising
Joined: Feb 2025
Posts: 10
Likes: 1
I think my earlier tests were a bit flawed, as now I am pulling 50 to 60 milliamps. I started pulling fuses related to the BCM, so far it was not the lumbar, powered seats, BOSE speakers, interior lights, IPC, or the passenger door module. I also checked the headlight motor fuses #3, and #4 and so far I have come up with nothing.