Last edited by MrDubberDad; 07-13-2013 at 08:30 PM.
Ignition switch? I have a bad one and it gives accessory power to some of the stuff in my car when it's in the off position. It can kill my battery in a about 12 hours. I'm just too lazy to replace it at the moment.
thank you, how do i check/test for that?
Borrow a known good one and plug it in and see if the issue goes away. I would just grab a new one. They're like 11 bucks or something and they're prone to go, so even if that doesn't solve it, you'll have a new one when yours does go bad.
awesome!! thank you so much for the advice
i disconnected the negative terminal, but left the the multimeter still hooked up between positive post n positive terminal, it went from 12.60v with negative hooked up, to a bunch of numbers goin back n forth after i disconnected the negative. any ideas?
nope, does not discharge when disconnected.
after driving your car for a while let it sit, then place one lead from your multimeter, that is set on amps to the positive terminal of the battery, place it in such a way so that when you disconnect the positive terminal that the first lead u placed on the battery doesn't have to loose connection and place the second lead from your multimeter on the cable from the battery you just took off
let me know what it says, if theres under .5 amps (500 milliamps) theres no problem with your car, just replace the battery
basically this but do it while the battery is disconnected and then remove the battery cable without breaking the connection wit the multimeter
With the engine running, the battery bolts measured from the battery terminal posts should be 1-2 volts more than with the engine no running, then you know the alternator is doing its job.
With the engine off properly connect the meter (in series), set for 10 amps, between the battery terminal post and the battery cable connector clamp, all doors closed and everything off. If there is a current leak, you will see its value in the meter.
thank you everybody soooo much, i am going to work on it when weather gets better.
How long before it drains the battery and how old is your battery?
It doesn't make sense that you have a drain and yet, there is no drain measured. The only thing left is that you lock the car and hold down (prope it down to hold it down) the engine compartment alarm button switch before measuring in case the alarm once engaged is causing a drain.
At .5 amp drain, a 60 AH (ampere hours) battery would last 120 hours, but cranking power may be gone at 60 hours, and you say it's cold so even sooner when cold.
What dubbed21 says is to measure volts with the a-c scale, not the d-c scale. There shouldn't be more than 0.5 volts on the reading or the diode set is bad and this may cause a misfire trouble code.
it drains over night. battery is 2 months old, and this problem has been happening before and after i got the new battery. altenator is like 3yrs old and autozone tested it and said its good, which i believe because the battery stays charged until i let it sit overnight. weather sucks again, i will try the alarm thing asap.
it did have an aftermarket head unit in it, but i took it out. i bought that harness so it would be hooked up right, i dont think i crossed wires. would those wires be crossed somewhere in the dash at all??