Cars resistance
#1
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Cars resistance
Has anybody ever checked their cars resistance (with a ohm meter/fluke)? My battery has this nasty habit of draining so I checked my charging system and I am getting a steady 14v. Then I checked the resistance through the positive and negative leads (with battery disconnected) and my resistance was only at 56.5K, which seems low in the first place. Then after the initial reading it stared to trickle down until it got to 11.5K and it stayed pretty steady at that point (took about 5 minutes to get there). After seeing that I then pulled each fuse 1 at a time looking for something to change the readings but was unsuccessful. I don't think this is normal and was wondering if anybody could confirm my suspicion. Also looking for recommendations, I really don't like having to keep my battery on a trickle charger :/
#7
I'm with Joe. Use an ammeter.
You should use one with a high amp capability (50A analog) at first. I clamp one side to the positive cable, then stab the positive terminal on top while lifting the cable off its post. Once you prove that the current won't be lethal to your DMM, switch to that.
Then as Joe stated, check what the current reading is, and pull fuses 'till it goes away. That'll be the offending circuit. Then pull the prints and go through that circuit.
--Alex
You should use one with a high amp capability (50A analog) at first. I clamp one side to the positive cable, then stab the positive terminal on top while lifting the cable off its post. Once you prove that the current won't be lethal to your DMM, switch to that.
Then as Joe stated, check what the current reading is, and pull fuses 'till it goes away. That'll be the offending circuit. Then pull the prints and go through that circuit.
--Alex
#8
you can also disconnect the ground cable from the battery, attach a test light inbetween them, and see how bright it is. pull fuses one by one till its really dim, after you figure out the fused circuit its on, start disconnecting each item on the circuit till it goes dim again.... does it have a aftermarket radio,factory amp, any sorta alarm, or has anyone gotten into the wiring ?
#9
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Those are all great recommendations, I had been talking with a friend about doing the very same thing...but I wasn't convinced it would do much seeing how neither of us had used that particular technique. Now I have something to occupy my mind on Sunday! Thanks for all the help. I'll have to get a new fuse for the ol' analog...I'll post updates as soon as I find the source. Also the car has an alarm system that hasn't been armed since the start of the dying battery, seeing how it's locked in the garage and all.
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