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Old 04-09-2013, 08:44 AM
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parasitic draw

Here is my question, but I will start off explaining why I have this question first.
Because of the birth of my daughter my truck has been sittin a lot more then usual it was about a month an a half before I felt the need to start it up and warm it up. And on doing this the motor would barely crank over ( batteries very low ). So I took both out and charged them ( 2.5 amps for 3 days )to get a nice good charge in them, plus I had the time.
Question 1. is it normal for a diesel to drain batteries in that long of time sittin?
So then I put the batteries back in the truck but before I hooked them up I put a multi meter in line with positive terminal on passenger side and noticed a draw of
.208 amps ( seems awful high to me ) so I start pullin fuses the only fuse that would make a difference was fuse 15 ( Generic Electronic Module , Powertrain Control Module, Anti-lock Brake System, Brake Shift Interlock, Speed Control ) Once this fuse was pulled the amp draw went to .049 amps Im guessing this might be normal current draw through out the charging system.
Question 2. is it normal for the Modules on Fuse 15 to draw .159 amps on its own?
Question 3. is .208 amps too much current draw?

thanks in advance for the help
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Old 04-09-2013, 10:49 PM
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Your ideal state should be <.05 A but it's not too uncommon for something to be drawing power. On mine I tracked it down to the transfercase drawing power through the GEM when the truck was off. Figured it was a good excuse to put in a manual shift unit. Do you have anything aftermarket like a alarm or stereo that might be spliced into something on that circuit?

Last edited by JSchuricht; 04-10-2013 at 02:06 PM.
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Old 04-10-2013, 06:06 AM
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First thing you have to realize is, that initial draw you see will go down considerably in the first 1/2hr. So, to know what you're dealing with over a 6 week period, you'd need to wait that long, without opening a door, turning the key, or Any other disturbances to the electrical system. Then see what your true draw is.

My truck, w/basic work trucks options only, comes down to around 180mA when all is said-and-done. I could let it sit a month I'm sure, don't actually know how long before I had trouble though

Maybe a good place to start would be with a Load Test of both batteries (NOT the "dinky" 100A testers the Parts Stores use, you need to load our Big Batteries at @ 300A) to be sure they're all they should be. If they're marginal, and never give you any other problems, then I'd consider some sort of "Float Charger" if you're going to let it sit that long again.
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