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Old 02-12-2012, 07:18 PM   #1
Captain Morgan
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Quote:
Originally Posted by askmrjesus View Post
Before you get too far into it, re-check the battery and do a load test. It may show 11.99999v on your multi-meter, but batteries are fucking liars and are not to be trusted.

Put the tester back on, then hit the starter switch. If the reading drops more than a couple of volts, the battery may have a bad cell (or 6...). If you do have some bad cells, you aren't going to get enough cranking amps to get the job done, and what your ass needs is a new battery.

JC
Yep. This happened with my car. I was driving one evening this summer and turned on the lights and the car died. I thought the alternator was shot, but it was a bad cell in the battery. Apparently, the alternator in my car was fine, but simply doesn't put out enough juice to run the A/C compressor, cooling fan and lights all at the same time. Turning on the lights was all it took to kill the car.
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Old 02-13-2012, 09:07 AM   #2
askmrjesus
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I should probably add that the aforementioned load test, needs to be done on a fully charged (or as fully charged as you can get it) battery.

Load testing a partially charged batt, will result in false readings and conclusions.

No Worries makes a good point. You should be reading somewhere around 12.75 on a topped up batt, especially if you're trying to start a very cold (sub-freezing) bike.

JC
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