Help tracking down battery drain

[TXRick]

Battery lasts about two days...

Black wire from positive.

White wire from positive.

Alt-S

EFI

Dome

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....

 

[s20004runner]

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.

 

[turbo8]

start pulling fuses until the amp draw lowers.

 

[jeremyc74]

Battery lasts about two days...

Black wire from positive.

Also...I'm not really sure I'm using this multimeter correctly....

Ok, so what you need to do first is put the positive lead in the "20 amp un-fused" port on the meter, and set for DC Amps (A..., not A~).

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:

 

[LittleCaesar]

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.

 

[baja1]

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!

 

[jeremyc74]

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.

 

[TXRick]

Sweet thanks for the info and the lesson. I'll get on it in the AM and let y'all know wassup.

 

[TXRick]

I hooked it up like you said. I tried both pos and neg terminals. It read 0.0 both times. What's that mean?

 

[TheDurk]

I hooked it up like you said. I tried both pos and neg terminals. It read 0.0 both times. What's that mean?

Did you switch to the 200ma port and setting? You should see 25-50ma from the radio and wireless door systems. If not, you are probably not making good contact with your leads. If you do, you have an intermittent drain or possibly an internal short in the battery. How old is the battery?

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.

 

[Ed_C]

I hooked it up like you said. I tried both pos and neg terminals. It read 0.0 both times. What's that mean?

Sounds like you blew out the multimeter's fuse

 

[jeremyc74]

Sounds like you blew out the multimeter's fuse

The 20A shunt on that particular meter is unfused. It's possible the meter isn't working, but more likely just a connection issue.

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.

 

[TXRick]

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?

After pulling Dome fuse.

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?

 

[TXRick]

Did you switch to the 200ma port and setting? You should see 25-50ma from the radio and wireless door systems. If not, you are probably not making good contact with your leads. If you do, you have an intermittent drain or possibly an internal short in the battery. How old is the battery?

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.

I have aftermarket radio, not hooked up and aftermarket wireless door system that worked last time I used it.

 

[TXRick]

The 20A shunt on that particular meter is unfused. It's possible the meter isn't working, but more likely just a connection issue.

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.

Yeah, def connection prob...also direction reading problem

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...

 

[TXRick]

Ok so I'm going to check the wiring in the radio first. The positive is not connected right now but I'm worried the acc wire is loose or something.
This thread shows the stuff on the dome fuse.

http://www.toyota-4runner.org/3rd-gen-t4rs/103821-15-amp-dome-fuse-keeps-frying.html

Any other advice?

Thanks!

 

[Sandman9]

Similar Problem

Hey guys, I read through this thread and gained some insights to my own issue with 2000 T4R limited Auto.

Heres the story.

Started a few months ago, when I would keep blowing my taillight/ dashlights fuse --> found a solution not a fix by putting a 15Amp fuse where there was a 10A.

Since then i have lost power to my hitch lights and disabled them.

And NOW! Battery will not hold a charge over night. Have located leaks to rear/ mirror defog, as well as fog lights. Defroster switch has not been used in a few months, and fog lights have been unhooked for a year (installed ARB bumper- no lights yet).. I have pulled the fuses and still have power running through both.. Only other electrical problem is the stereo backlight is burnt out.

This latest drain just sprung up a week ago.

I am no mechanic, but pretty capable on the tools.. never messed electrical though. Would like to keep it out of the shop to save the funds.

Any info, suggestions or similar case solutions would be helpful.

Cheers.

 

[IBallEngineer]

Hey guys, I read through this thread and gained some insights to my own issue with 2000 T4R limited Auto.

Heres the story.

Started a few months ago, when I would keep blowing my taillight/ dashlights fuse --> found a solution not a fix by putting a 15Amp fuse where there was a 10A.

Since then i have lost power to my hitch lights and disabled them.

And NOW! Battery will not hold a charge over night. Have located leaks to rear/ mirror defog, as well as fog lights. Defroster switch has not been used in a few months, and fog lights have been unhooked for a year (installed ARB bumper- no lights yet).. I have pulled the fuses and still have power running through both.. Only other electrical problem is the stereo backlight is burnt out.

This latest drain just sprung up a week ago.

I am no mechanic, but pretty capable on the tools.. never messed electrical though. Would like to keep it out of the shop to save the funds.

Any info, suggestions or similar case solutions would be helpful.

Cheers.

Don't worry, most mechanics aren't technicians anyway. Do you own or have access to a meter capable of checking amps?

 

[TXRick]

Turns out the satalite receiver was hooked up to constant power. Can't get the radio to work even though it's getting power. The fan blows in the back but nithing else. It's probably fried...the fuse on the back is good.

Battery still feels weak, just did cs144 upgrade but haven't done the big 3. It shows 13.6-13.8 vikts when it's running. I was expecting more.

 

[Sandman9]

Yes i have a good multi-meter with amps.. I took out the fuse and relays to defroster, ht mirror, and fog lights and have all the battery connection cables and grounds a good clean today