Hot answers tagged

16

Standard digital multimeters can measure current and help you identify what in your vehicle is consuming your battery's juice. Get an electrical diagram of your vehicle and try to narrow it down by doing current measurements in the various major paths of flow. When your car is off, no (or only trace) current should be flowing. Every time the path of ...


14

Find your fuse box diagram. With everything off, pull fuses out one by one and use a multimeter on the fuse socket to measure the current drawn through that circuit. That will give you some indication as to what is causing the power drain.


6

If the fuse is blowing as soon as you perform an action it's a short to ground. Multimeter won't do much good in this situation. It'll come down to wiring diagrams and visual inspection of the harness and connectors on the circuit. Unless you have a fancy tool that will find the short for you. It looks like fuse 21 powers a bunch of stuff, but since the ...


5

The parking lamp/headlight switch applies power or ground so the circuit would be open if you were testing with the switch off. Same with the turn signals. The tail lights are on separate circuits. They don't share a ground. Does the car have an aftermarket trailer harness? If not your going to have to remove panels and visually inspect the harness for ...


4

In addition to an unexpected electrical load, as covered by Captain Claptrap, there are other things to check. The two biggest killers of lead/acid batteries are overcharging and vibration. Unless you have the equipment and the skills to use it properly (in which case you probably wouldn't be asking) I suggest you get the charging system checked by an ...


4

Same problem but another forum suggested that the key in their 98 GC can be removed one click past the off position in the ACC on position. Sure enough, checked mine and found the batt drain was due to the key switch being left in ACC and then being removed. Key shouldn't come out there but it does. I screwed a small metal bracket to stop the key switch ...


3

Wow I can't believe the basics are totally not listed here. First of all, since you know its draining the battery, disconnect the battery, charge it, then check to see if it is still draining on its own. Saying that for anyone that hasn't tried that first to double check the battery itself. Then there are the basics. The alternator check: you can use a ...


3

I know this is an old forum, but i need to comment. i have a 1998 jeep grand cherokee laredo that i bought for my daughter to use. the battery was brand new when i got the jeep, but soon after purchasing it i would find if it sat a few days without driving it the battery would be completely dead. i searched online, asked my mechanic friends and didnt hear of ...


2

As Zaid said, start with crasic's excellent answer in: How do you test analogue electrical circuits? . For your situation specifically, I would introduce a small voltage between the fuse holder of the fuse that is blowing, and ground. Use a continuity noise generator or a light bulb so you can hear or see your progress. Then, get into that bundle of wires ...


2

That just means that particular circuit is an always on circuit and not switched by the ignition. When you reconnect the battery lead the computer is probably doing a power on test and as such some relays are being activated such as testing the fan etc.


1

I assume youre talking about a parasitic drain. A "short" is easy to find because it will blow a fuse. Take a compass around the wiring and it will point to the location of a "short". Another easy way to find a short is using a guass gage(google it)


1

The only foreseeable problem would come from mixture problems due to your O2 sensor readings. Look for a wiring diagram somewhere, and see if the components share any common grounds or points. Repairing a wire can be cheap if you can do it, as the bulk of the labor cost will likely come in trouble shooting it. As far as the EGR goes, it is more of an ...


1

I can say is the easy way for you is to get a low amp tester remove the neg of your battery. Put the tester on neg side of battery and on neg cable of vehicle. Light will come on if there is a drain some where. If there is, remove fuses 1 at a time. Every time you remove a fuse check the light. If it goes out then you know at least what cicuit is draing ...



Only top voted, non community-wiki answers of a minimum length are eligible