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Master fuse??
10-12-2015, 01:14 PM (This post was last modified: 10-12-2015 02:16 PM by Elvhus01.)
Post: #1
Master fuse??
While working on the overhead console in my 2004 Explorer, something shorted out and I lost a lot of component functionality. The car runs, but I have no interior lights, instruments, radio, climate control, power windows, moon roof, etc. I do have headlights, tail lights, turn signals, power seats, windshield wipers, etc.

I've checked individual fuses both under the dash and under the hood and everything tests out OK with my continuity tester.

Currently looking online for a wiring diagram to help the troubleshooting process.

Suggestions?

Thanks for reading.
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10-12-2015, 05:46 PM
Post: #2
RE: Master fuse??
Not familiar with this particular vehicle but most these days have either several master fuses in or near the fuse block under the hood. They may also be located on or near the battery positive connection. They are much larger than typical fuses and usually rated at 40, 50, 60 amp to feed groups of electrical items. If you come up empty checking with either a test light or meter you may have actually burned up a wire or possibly damaged the BCM. (Body Control Module) The only way I know of to check the BCM would be using a full function scanner at a garage or parts store.

Let us know how you make out.
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10-12-2015, 09:10 PM
Post: #3
RE: Master fuse??
Thanks.

I'm completely baffled why shorting out the overheard console map light would cause all the other components to cease functioning.

I'll likely have to take it to the shop.
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10-12-2015, 09:27 PM
Post: #4
RE: Master fuse??
To clarify further, the BCM is what controls the convenience items like dome light delay, headlight delay (off after a short spell), the delay on the radio, wipers, and electric windows so you can finish a cycle just after the key is switched off, etc. They can crap out completely or partially. (certain items) Instruments? Depends on the car. On some vehicles the mileage is stored in the BCM and it allows you to check it (on some) without turning on the key.

Off on a slight tangent for a moment... I had a 96 Grand Caravan with a code stored for "serial buss communications error" which made me believe I had a BCM issue. Turns out it's common on that vehicle to have a bad solder joint on the back side of the dash cluster. The fact that you (possibly?) shorted something may have cause a poor connection somewhere to go totally on the fritz. IOW, it may take some doing to track down but the actual fix may be simple / cheap.

Good luck and keep us posted.
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