Dead Battery Again!!!
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Joined: May 2004
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Dead Battery Again!!!
I have a '99 F250 with a 7.3L Powerstroke. The driver side battery was dead so i replaced it. The stock guage shows it is charging, but two days later the new battery was dead. I recharged it left the truck run for about 10 minutes showing it was charging. Today the new battery is dead overnight from just sitting. Any suggestions???? 
Posting Guru
Joined: Oct 2003
Posts: 1,332
Likes: 4
From: Baltimore
I have an 03 and it has run-down protection, that automatically turns off power to anything causing current draw (i.e. lights, power port, etc). I imagine your vehicle has the same feature. Purhaps there is a failure of whatever controls that circuit or maybe you bought a defective battery.
Posting Guru
Joined: Jul 2002
Posts: 1,372
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From: Broussard USA
You have a short somewhere, go have it checked. A quick test is to pull the positive cable, put a volt meter om the bat pos and the cable end, if you read volts you have a current draw. You can start pulling fuses one at a time till it goes away and that is the short, if the short is after the fuse.
Junior User
Joined: Apr 2003
Posts: 88
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From: Huntsville, AL
The batteries in these trucks are in paralle, meaning they are being charged and discharged at the same time. If on one is being discharged I wonder if the battery cables are good and the connections are clean. Also check the ground for the alternator and batteries at the engine or chassis. I had an explorer that they replaced the battery and the alternator at the dealer for the same problem and found that it was a dirty connection at the block that was not allowing it to charge fully. Cost Ford about $400 to find that out (all under warrenty).
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