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Old 06-18-2014, 07:01 PM
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Hunting down a power draw

2006 F250 Lariat 4x4 CrewCab Shortbed. Diesel of course. 130K miles.

I've been having a problem with a draw. The batteries will drain in a few hours if I don't leave it on the trickle charger. I had assumed it was the batteries, but they test well as does the alternator. So today I went hunting and narrowed it down to the following possible culprits on the interior fuse box using a test light:

#11 (Radio) - I figure this takes some current all the time to run the clock, and the radio seems to work just fine and doesn't run when the key is off. But I'm open to suggestions.

#19 (Body Security Module) - Got me. I've got no idea what the heck this thing is.

#34 (BOO Switch) - Brake On/Off switch? It says in the manual "low current," but it's bright on the test light. The brake lights seem to work normally.

#2 (Cluster) - I'm assuming this is the instrument cluster. Just a low-current flicker, and again I figure that's probably normal.

I was in a rush to get the panel put back together and didn't pull out the multimeter to get amperages. It's not throwing any codes or lights.

That said, any of you with more experience (this is my first F-series) to give me some hints as to which of these sounds like the most likely culprit?

Thanks in advance,
Pat

Edit: and, obtw, howdy all, as this is my first post.

Last edited by farmerpat; 06-18-2014 at 07:02 PM. Reason: Manners
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Old 06-18-2014, 07:45 PM
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do you have a glove box light?

and welcome to the .org
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Old 06-19-2014, 06:13 AM
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Quote:
Originally Posted by junior125 View Post
do you have a glove box light?

and welcome to the .org
I'm joining this to follow along as I have the odd issue with drain as well, however mine takes a week or more. As for the glove box light, my 07 doesnt have one were they an option or another thing ford cut out in the later years?
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Old 06-19-2014, 09:05 AM
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Quote:
Originally Posted by junior125 View Post
do you have a glove box light?

and welcome to the .org
Thanks, and no light.
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Old 06-19-2014, 09:11 AM
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BOTH batteries will drain in a few hours but pass a test?

No way thats possible, overnight maybe, but a few hours? You have more than a parasitic drain.

What kind of test was it?
What kind of batteries/how old?
How do the cables look?
What does the meter say the batteries are at key on and at idle?
What mods on the truck?
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Old 06-19-2014, 01:06 PM
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Quote:
Originally Posted by Heavy_GD View Post
BOTH batteries will drain in a few hours but pass a test?

No way thats possible, overnight maybe, but a few hours? You have more than a parasitic drain.

What kind of test was it?
What kind of batteries/how old?
How do the cables look?
What does the meter say the batteries are at key on and at idle?
What mods on the truck?
By a few I mean 6-8, which could be overnight. I've always kept it on a trickle charger because we don't use it but once a week or so. Realized the problem when my wife and kids were at a horse show and it wouldn't start in the afternoon.

Test was a voltage and load test - two separate parts stores. Batteries are stock - type. About 5yrs old according to the stickers (I bought the truck 3 years ago) which is why I suspected them first. Cables are in great shape, and no corrosion on the terminals or mounts.

Only non-stock mod to the truck was a Satellite Radio, but I disconnected and removed that since I don't use it and it only seemed like a reason for someone to break in. Bit of a jury-rigged power system on that boy - they wired in a cigarette lighter adapter behind the dash then plugged the power cord into that adapter. But like I said, that's gone now.

It's definitely got a draw off those four circuits. Like I said, the cluster one seems pretty low and probably normal. But that BSD and BOO are strong draws. I'm on the road right now but will pull the multimeter out to get readings when I get back.
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Old 07-10-2014, 01:52 PM
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I'm having the same problem, did you find the problem?
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Old 07-15-2014, 08:26 PM
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I agree, more than a parasitic drain. Are you sure your alternator is charging? Your alternator can also drain if you have a bad diode.
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