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My battery keeps dying which I have replaced twice in 14 months. The alternator was tested and this is not the cause? Any suggestions would be greatly appreciated. Thank you

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Not everyone knows how to test alternators adequately ... but that is not to say that whoever tested your alternator did anything wrong either!t

One of the most annoying situations to have in any vehicle, is a mystery drain on the battery. It could be something as simple as a light not turning off somewhere. A trunk light that stays on, a glove box light, or any other lighted enclosure, an under-hood light, or perhaps even a defective phone charge cable that draws current even if the phone is disconnected!

If you have a voltmeter anywhere, connect it across your battery, AFTER setting the correct range and function on the meter. The voltage will be 14.2 to 14.6 VOLTS (NOT AMPS!!!) with the meter connected across the battery terminals, the engine idling, and as many things turned OFF as you can control. If the voltage is 12 point something, when idling, either the alternator is defective or not turning!

Any multi-function meter you get will probably have some current ranges. If you are not afraid to, you could (with the engine off and cooled off), DISCONNECT one battery terminal. Then connect your meter (as a CURRENT meter), in series with the disconnected battery terminal. Read the meter, and that will tell you IF you have a drain on the battery, and how much drain (in amps).

Such meters are very low cost at places like Harbor Freight Tools! Well under ten bucks!

Posted on Apr 17, 2017

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