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Old 09-26-2012, 01:28 PM
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Batteries keep dying

06 F 350 King Ranch FX4. Having some battery issues. Sometimes the truck starts fine, other times I go to start it and the batteries are dead. I will charge them up, they will be fine one day the next they may work fine or may be dead again. Had the batteries load tested, they are fine. Alternator checked (only 8 months old) it is good. I've checked for a short in the wiring, found nothing. Not sure whats going on. Any ideas are appreciated. Thanks

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Old 09-26-2012, 01:31 PM
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Parasitic drain. What all is on in the truck when you have the key off? Alarm, GPS, satellite, etc...
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Old 09-26-2012, 01:57 PM
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Nothing is on. I don't have an alarm, gps or anything. Even started unplugging my phone charger when I get out. I have a scan gauge but it goes off when I turn the truck off. The only thing is that my "dinger" stays on if the driver door is open even when the keys aren't in the ignition, but it goes off when the door is shut

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Old 09-26-2012, 02:35 PM
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Then it is def a parasitic drain.
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Old 09-26-2012, 02:43 PM
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Originally Posted by westcoaststrokin View Post
Then it is def a parasitic drain.

Meaning???
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Old 09-26-2012, 02:45 PM
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You have something that is draining your batteries even when the truck is off. Hold on I will do a quick search on how to troubleshoot it.
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Old 09-26-2012, 02:48 PM
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How to Find a Parasitic Battery Drain: 9 steps - wikiHow
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Old 09-26-2012, 03:42 PM
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Just got my alternator back on. Batteries were down to about 70%. Got them charging now. Figured it would be better to do the test with the batteries fully charged. My only concern is that this doesn't happen all the time. So I need to perform the test when it is happening, who knows exactly when that is. Ill post my results. Thanks.
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Old 09-26-2012, 05:22 PM
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Just finished the test. According to the directions I should get no more than a .25-.50 reading. I charged my batteries then started my truck and let it run for a few minutes, turned it off and followed the instructions. At first I was getting a reading of about 1.00-1.05, after about 30 secs it dropped to, .49-.52, then about 15 secs later dropped down to .05-.07 and that's where it stayed. Did this test on both batteries not just one and got the same results on both. Not sure where to go from here? Thanks for the info but u or anybody else got any more ideas?
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Old 09-27-2012, 04:33 PM
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Quote:
Originally Posted by 06kngrnch84 View Post
Just finished the test. According to the directions I should get no more than a .25-.50 reading. I charged my batteries then started my truck and let it run for a few minutes, turned it off and followed the instructions. At first I was getting a reading of about 1.00-1.05, after about 30 secs it dropped to, .49-.52, then about 15 secs later dropped down to .05-.07 and that's where it stayed. Did this test on both batteries not just one and got the same results on both. Not sure where to go from here? Thanks for the info but u or anybody else got any more ideas?
You need to finish the procedure to accomplish anything. I've done the same thing, but with a test light. Make sure your door light and hood light are off before you start.

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