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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,
Edit: and, obtw, howdy all, as this is my first post.
Last edited by farmerpat; 06-18-2014 at 08:02 PM.