Help tracking down battery drain
Battery lasts about two days...
Black wire from positive. http://i1353.photobucket.com/albums/...o.jpg~original White wire from positive. http://i1353.photobucket.com/albums/...1.jpg~original Alt-S http://i1353.photobucket.com/albums/...j.jpg~original EFI http://i1353.photobucket.com/albums/...c.jpg~original Dome http://i1353.photobucket.com/albums/...d.jpg~original Amps not hooked up but says it draws 11.8 when tested. Do any of these look right? The doors were shut and I double checked to see if any light were on...all lights off. EFI? No idea ALT-S? No idea Also...I'm not really sure I'm using this multimeter correctly.... |
here was my case.
rear hatch lights were on 'door' position, the rear hatch wasn't completely shut and the light was not on, but it would drain the battery. I leave it on 'off' position and shut the door firm and fixed the problem. I don't know if it's common or not, but that was my case. |
start pulling fuses until the amp draw lowers.
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IMPORTANT!!! Be very careful after once you put that lead in that port on the meter. The meter now acts as a direct short that's not fused. If you try to read battery voltage with it in that configuration there will be smoke, sparks, and you will blow your meter up. This is what my high school electricity teacher referred to as "letting the smoke out of the meter". Next you need to put the meter in series with the current path. To do this remove the entire terminal from the positive post on the battery. Use a couple of clothes pins or some other non-conductive clamp and hook the multimeter leads up in between the battery (+) terminal and the positive cable. (You can also do this on the negative side of the battery, which is safer if you're in danger of shorting to the chassis) The polarity doesn't really matter, you're just looking at the absolute current flow in this case. At this point you should be able to see the current draw from the battery. Start pulling fuses one at a time and note the change in the current draw for each one. If it's a constant drain you should be able to narrow it down like that. If it's an intermittent drain it may get more complicated. Here's some more information with some graphics of the meter connection. Testing for Battery Drain - Randy's Repair Shop Again, be mindful of your meter leads being plugged in to the current port on the meter. Don't leave it like that when you're finished because you won't notice it next time. Every electrician I've ever met has blown a meter up in their career, myself included. :first: |
Jeremyc is spot on, though I'd say to use the negative terminal/cable and not the positive for testing. I saw someone not only blow the cheap HF multimeter but also he fried either a PCM or some circuit board for a blower motor that made his problem that much worse.
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good advise. my culprit turned out to be the rear window defogger, didn't even know I had one! pulling the fuse caused the parasitic draw to drop off but not all the way. turned out I also had to remove the defogger relay. I still don't understand it all but that cured my ill. so don't forget to pull relays also!
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One other thing...... start out with the meter on the 20 setting, and see where you're at. If it's at .2 amps or less, drop down to the 200ma setting for better resolution. You may have to just stick with 20, depending on how heavy the draw is. Based on what you're saying about the battery life if it's a constant drain I'm betting it's right around the 200-300mA range.
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Sweet:) thanks for the info and the lesson. I'll get on it in the AM and let y'all know wassup.
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I hooked it up like you said. I tried both pos and neg terminals. It read 0.0 both times. What's that mean?
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You can rule out the battery by leaving the negative terminal off for two days and see if you can start the car when you reconnect. Also check voltage at beginning and end of the period just before you reconnect. |
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OP, when you get the meter connected make sure the dome lights are still working. The entire current draw for the vehicle is passing through that meter though, so don't turn on any heavy loads while it's connected. |
When dealing with Rick, the first thing to assume is that he's been drinking (it's summer and that's what teachers do all day) and probably semi-followed instructions...so multimeter works fine...operator error.
Hooked up correctly, right? http://i1353.photobucket.com/albums/...e.jpg~original After pulling Dome fuse. http://i1353.photobucket.com/albums/...y.jpg~original All doors shut and lights switched to off. What else is hooked up to this fuse? What should I check? Is that enough drain to kill the battery in a couple of days? |
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Front dome lights working with meter connected , jumps up to 9 when light is turned on. Rear hatch works intermittently. If I bang on the latch, the rear light will start working. Battery is from 12/13 not many miles on it since then. I took the battery up to Autozone and they tested it a few months back. They said it was ok... |
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