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  #1  
Old 01-06-2011, 12:52 PM
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Batteries draining

If I let my truck sit for more than 24 hours the batteries will be dead. The only thing "aftermarket" is a radar detector and a streamlight flashlight, but the batteries will still drain even when they are unplugged.

How much does a stock truck draw? Any common problems on these trucks that cause a draw?

Batteries are good, alternator is good and as is the starter.
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Old 01-06-2011, 06:31 PM
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Old 01-07-2011, 08:43 AM
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Old 01-07-2011, 09:16 AM
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Had the same problem with mine also had a bit more stuff than you mentioned hooked up, messed with it for quite a while untill I changed batts, 1st they were missmatched, one was a 850 cc the other a 750 cc smaller one would pull down the 850 causing them to drop under 13v put in two new 850's problem gone and thats been a year ago
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Old 01-07-2011, 09:31 AM
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Interesting. My batteries are miss-matched.
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Old 01-07-2011, 01:20 PM
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well then fix it.



but that shouldnt cause them to be dead the next day. there must be a oem draw thats faulty.
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Old 01-07-2011, 02:06 PM
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What's the correct way to test for a draw on a dual battery setup?
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Old 01-07-2011, 03:44 PM
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Quote:
Originally Posted by Goose350 View Post
What's the correct way to test for a draw on a dual battery setup?
Did I ever give you a copy of the 99 factory service manual on CD?
It has a detailed procedure for testing amp draw, it involves waiting specified times and not opening doors and stuff like that so that the computers can "go to sleep". The procedure might be different on the sic-o's

edit;
I'll bet you if you get 2 new matching good quality 1,000 CCA batteries the problem will go away. I swore mine were good and even tested them with my load tester but in the end they were the culprit or at least the weakest link in the chain of problems.
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Old 01-07-2011, 03:56 PM
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No, you have not given me the CD. I want to be sure it is the batteries before I buy new ones. I am in need of a FICM, so I dont need to spend the extra money unless I have to.


Where did you get your 1000cca batteries?
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Old 01-07-2011, 05:03 PM
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does the ficm always have power or when the engine is on?
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