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Fel
04-17-2009, 08:55 AM
Okay, so I'm having this awesome problem with my battery....

If I leave the car off for more than a day, the battery dies. It's not the battery, I've already replaced it with no results. I've also checked a few times that I'm not leaving any lights on or anything.

Kind of sucks going somewhere and fearing that your car might not start by the time you get back to it.... I've taken to disconnecting the positive lead on the battery every time I'm out and parked jsut so it doesn't drain.

So my question is..... where do I start?? What could possibly be causing it? (Out of the 10 billion posibilities....) Could someone give me a checklist of sorts of what I should look at as a possible drain?... maybe starting from cheapest to most expensive... :D

Thanks...

richie_s999
04-17-2009, 10:15 AM
aftermarket stereo install???? most common place for things to go wrong with battery drain

djcontra
04-17-2009, 10:20 AM
I am having this problem on my e36 since it sat for a year. Before tracing all your wires and ripping apart the stereo take a wire brush or rough sandpaper to your battery terminals and clamps. Really rough them up until shiny then try again, then rinse everything with some baking soda and water mixture. I did this on mine last night and have been letting it charge overnight. I'm hoping in a few minutes my issue will be solved :)

Some dielectric grease on the terminals is also a good idea...

DriveItSideways
04-17-2009, 10:42 AM
Its too bad im an asshat, I have lots of advice to give on electrical diagnostics.

Fel
04-17-2009, 11:10 AM
Its too bad im an asshat, I have lots of advice to give on electrical diagnostics.

That's cool, you have no obligation to do anything to help others.

DriveItSideways
04-17-2009, 11:13 AM
That's cool, you have no obligation to do anything to help others.

thats right, but I would have helped if you didnt stick your nose out where it didnt belong.

Fel
04-17-2009, 11:23 AM
thats right, but I would have helped if you didnt stick your nose out where it didnt belong.

*sad*

matty.dc
04-17-2009, 12:37 PM
Wow are you serious? The guy is obviously in a jam. Help him out.

Bullet Ride
04-17-2009, 12:45 PM
Bust out the electrical tester and start checking for current flow on fuses and relays in your fuse box. If you find that there is some current flow you can find out what the fuse or relay provides power to and start inspecting those systems.

Fel
04-17-2009, 12:51 PM
Bust out the electrical tester and start checking for current flow on fuses and relays in your fuse box. If you find that there is some current flow you can find out what the fuse or relay provides power to and start inspecting those systems.

Yeah, this is what I'm gonna do.... soon as I track down a meter. I'm kind of curious whether my trunk light is staying on or something... but I'm not gonna lock myself in the trunk to find out :)

There are also aftermarket audio components installed, before my ownership, so they may or may not be contributing to the problem. I guess testing which circuit is causing the drain will help me determine where to look.

Wow are you serious? The guy is obviously in a jam. Help him out.

Don't mind him, dude... he's srs bsns.

Axxe
04-17-2009, 12:51 PM
Get a good quality multimeter, unhook main batter positive lead (use the one on the firewall, closer to fuse box). Set multimeter on ammeter mode, run in series between positive terminal block on firewall and main lead to fuse box. If you have a current flowing you have a drain somewhere, start pulling fuses out of the fuse box until the reading changes, and then investigate that circuit. I had a similar problem, turned out to be the interior constant line (for radio), there was a small cut and corrosion in the wire causing a tiny short to the chassis that didn't draw enough current to blow the fuse but enough to drain the battery overnight.

djcontra
04-17-2009, 01:25 PM
Hey just an update on the post I made here earlier.... my e36 starts up and holds charge no problem now since I cleaned the battery terminals. Try it, it might be that easy :)

Fel
04-17-2009, 01:30 PM
Get a good quality multimeter, unhook main batter positive lead (use the one on the firewall, closer to fuse box). Set multimeter on ammeter mode, run in series between positive terminal block on firewall and main lead to fuse box. If you have a current flowing you have a drain somewhere, start pulling fuses out of the fuse box until the reading changes, and then investigate that circuit. I had a similar problem, turned out to be the interior constant line (for radio), there was a small cut and corrosion in the wire causing a tiny short to the chassis that didn't draw enough current to blow the fuse but enough to drain the battery overnight.

Thanks for the info man. You comin out tonight?

Axxe
04-17-2009, 05:09 PM
Don't know, working as usual, depends on how early I'm done. No plans for womenz after so I might as well show up at the meet if I'm done. 50/50 chance.

propr'one
04-17-2009, 07:09 PM
PM quack. Have him sell you a battery kill switch (they come on new cars). He jewed me for 15$, but he might give it to you for 10$.

juzer
04-18-2009, 11:19 AM
Okay, so I'm having this awesome problem with my battery....

If I leave the car off for more than a day, the battery dies. It's not the battery, I've already replaced it with no results. I've also checked a few times that I'm not leaving any lights on or anything.

Kind of sucks going somewhere and fearing that your car might not start by the time you get back to it.... I've taken to disconnecting the positive lead on the battery every time I'm out and parked jsut so it doesn't drain.

So my question is..... where do I start?? What could possibly be causing it? (Out of the 10 billion posibilities....) Could someone give me a checklist of sorts of what I should look at as a possible drain?... maybe starting from cheapest to most expensive... :D

Thanks...

Check the trunk light switch, i had same problem for a month untill i find out trunk light is on constantly.

richie_s999
04-18-2009, 11:41 AM
take the bulb outa the trunk to see if it still drains, with no light the circut is broken and would not drain it

everlast
04-18-2009, 12:10 PM
Don't bother with battery switches or spending hours on the internet hoping someone will miraculously know what's wrong. There is exactly ONE way to determine why your battery is dying:

Get a good quality multimeter, unhook main batter positive lead (use the one on the firewall, closer to fuse box). Set multimeter on ammeter mode, run in series between positive terminal block on firewall and main lead to fuse box. If you have a current flowing you have a drain somewhere, start pulling fuses out of the fuse box until the reading changes, and then investigate that circuit. I had a similar problem, turned out to be the interior constant line (for radio), there was a small cut and corrosion in the wire causing a tiny short to the chassis that didn't draw enough current to blow the fuse but enough to drain the battery overnight.

Princess Auto and Canadian Tire have digital meters on sale on any given week for under $10. That's adequate for your needs.

Ej_Red
04-20-2009, 09:46 PM
You can also disconnect the battery negative cable in the trunk and run ammeter in series in between battery ground and ground cable in the trunk. Take the trunk light bulb out though. Your doors suppose to be closed and your key suppose to be out of ignition. You should wait at least 5 minutes and the drain should not be more then 1 amp. It should be around 0.5 or so. Now if you find a drain, start pulling fuses one by one to see which circuit the drain is on.

Fel
04-21-2009, 11:51 AM
Don't bother with battery switches or spending hours on the internet hoping someone will miraculously know what's wrong. There is exactly ONE way to determine why your battery is dying:



Princess Auto and Canadian Tire have digital meters on sale on any given week for under $10. That's adequate for your needs.

Yep, that's the plan... Axxe talks smart words. *shiner*

Soon as I pick up a multimeter, I'll test it out and report back. Until then, I'll just continue with my disconnect/reconnect routine.