Any Experts on 2010 Sport Trac Electrical Systems here?

[JoeCanada]

My BIL has a 2010 Sport Trac Adrenalin that is eating batteries like no tomorrow. One shop he took it to told him he had a bad battery, he buys a new one, truck kills it in a couple days, exchanges for another new one, kills it again...you see where this is going.

So he brings it to me, and the first thing I check is what the truck is drawing for current just sitting there with nothing on, it's pulling over half an amp. Probably what's killing the battery. So I go through and pull fuses until the current drops, and it turns out pulling fuse 2 on the interior panel brings the current draw down to almost nil.

Problem is, the manual is very undescriptive as to what fuse 2 is for - it just says 'Microcontroller'. OK, microcontroller for what? Pulling that fuse knocks out the radio, locks, keyless entry, power windows, signal lights, maybe more I haven't noticed, but the truck still starts and runs.

Anyone have a electrical diagram, or an idea of what is on the circuit fed by fuse #2? I've been searching, but there isn't a ton of info out in the wild on these Sport Tracs.

 

[JohnnyO]

Go to either www.sporttrac.org or the Facebook page for Ford Explorer Sport Trac Owners. If Todd Z sees your post he will probably know.

 

[ericbphoto]

That microcontroller is sometimes called the GEM or body control module
Probably had other names, too. In it are timing circuits that are supposed to turn off certain electrical systems/circuits after a certain delay time. For example; turning off the headlights X seconds after you remove the key or turning off the radio X seconds after you remove the key. This is sometimes called the "battery saver relay" circuit. When that malfunctions, your battery dies fast. One circuit turns off the dome/courtesy lights a period after you close the doors. So, that gets tricky when you are troubleshooting it because you will have a tendency to want the door open while you walk around checking fuses and lights and things.

Anyhow, get the GEM/ body control module checked.