4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

batteries keep dying

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Old 04-29-2012, 03:36 AM
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timothyphicks02
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Default batteries keep dying

I had a battery in my car kept dying took it in and was told it wouldn't hold a charge, so I bought a brand new one. Same problem. If I dont drive the car every day it dies in 2-3 days. Like not enough charge to use power locks even. no lights are staying on alternator was checked and is good, fan wired correctly everything I know to check (not enough obviously) has been checked. any Ideas?
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Old 04-29-2012, 06:48 PM
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Martin6107
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Electrical problems are just the worst. Connect an amp meter to your battery and start pulling fuses one by one to figure out which circuit is the culprit.

My 95 would hog batteries for no reason until I replaced the old stock radio with a spare Alpine head unit we had laying around. Yup - the darn stock radio would draw the battery to nothing over the course of a week. Now I have great tunes and a battery that holds voltage.
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Old 04-29-2012, 07:05 PM
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cliffyk
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Here's a link to the charging system tests from the shop manual--in particular check out the battery drain (aka "dark current") tests...
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Old 04-30-2012, 09:47 AM
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timothyphicks02
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Thanks people. Ill get to looking at it in the next week or so. (moving)
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