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Something is killing my battery

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Originally Posted by dudeman2009 4 milliamps is about right. After 10-30 minutes that would have risen slightly, but thats ok. ...

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Old 12-29-2016, 02:08 AM   #11 (permalink)
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Join Date: Dec 2016
Location: California
Age: 25
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Ram Year: 1999 Dodge Ram 1500 Sport
Engine: 5.2L
Originally Posted by dudeman2009 View Post
4 milliamps is about right. After 10-30 minutes that would have risen slightly, but thats ok. Any problems on this age of vehicle would've been apparent right away.

I would complete that second test I wanted you to do, or clean off the top of the battery really well.

To test the alternator, start the vehicle and let it idle for about 5 minutes. Then turn on everything, high beams, fogs, high speed blower motor, interior lights, etc. and let it idle for another minute. Then test voltage at a few places.

Across the battery terminals.
From battery positive to bare metal on the engine or the alternator casing.
From battery negative to the alternator positive stud.

The battery terminal measurement is your baseline, neither of the other two readings should vary from it by more than a volt. The battery voltage should be no lower than 12.8V during the test.

To test the battery, charge it first. To test if it is charged measure the terminal voltage with the lights off. If the reading is above 12.8V you must first remove the surface charge by running the headlights for 2 minutes. Then let the battery settle for 5-10 minutes after that. Then measure the battery voltage, it should read no lower than 12.4V. Anything less indicates a weak battery for a standard flooded lead acid battery.
I will try the second test tomorrow. The top of the battery is pretty clean as its only 3 months old.

I will also do the other test mentioned and get back to you on the results.

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C2ndLTpigeon is offline   Reply With Quote

battery dead, volt short

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