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in my 2005 F250 WITHOUT factory brake controller/upfitter switches, I'm trying to identify this plug stuck in the back of the plastic tray. The empty spot next to it is where the brake controller plug was before I hooked up my aftermarket controller.
I recall seeing something about this when I did the install years ago, but can't find any info now. The red wire is 12+ with the ignition off, haven't traced out the others yet.
I'm not sure either, but I am interested to find out as well. I'll tell ya, that 12v ignition wire was sure helpful in wiring up my secondary upfitter switch setup
They must be the ones that control the master cylinder that goes with the factory TBC system. I expect to find a plug in the engine compartment for it.
So, the ignition & hot wires are up for grabs as NorEaster found out