Whose good with a Multimeter? - Ford Mustang Forum
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post #1 of 3 (permalink) Old 01-04-2009 Thread Starter
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Whose good with a Multimeter?

I think I have a short somewhere because when I went out today to go somewhere my car wouldn't start and the battery was dead. I have a multimeter that someone gave me but I've never used it. I want to figure out how to measure if there is a draw on the battery and how much. I've been told that the computer and alarm pull around 20 - 50 milliamps so anything above that will mean somethings drawing power. Also, if you can tell me how to check if the battery is good or not. Once I figure out the power is being drawn then I can get into the fuse box and figure out where(fun)
I bought the battery about a year ago so it should still be good but I have heard some horror stories about Optima batteries. Hopefully, that isn't the case since that ******* was expensive!

This is the multimeter I have:



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post #2 of 3 (permalink) Old 01-04-2009
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Disconnect the negative terminal on the battery. Plug the red lead into the left socket marked 10A and the black lead into the center com. Selector switch to amps (DCA). Hook up the meter in series-red lead to the battery terminal, black lead to the ground wire. You should be reading the draw with the key off. Make sure the battery is charged.


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post #3 of 3 (permalink) Old 01-11-2009
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You could take your car up to an auto store. (ie: autozone; advance auto parts) they will check your battery and alternator for free.
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