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Appreciate the insight. I will see if I can get to it. The FSM isn't all that clear.The yellow connectors are for the airbag circuits, they're yellow specifically for that reason - don't mess with them lol.
Now, my diagrams don't indicate individual connectors, but from my memory of the wiring on my 97, the white wire leaves out of the brake switch, goes through a connector at the top of the steering column support, then splice packs into several white wires - one of which went to the CHMSL without ever going through the firewall, though I don't remember every connector it passed through to get there.
Trailer brake controllers don't use Ethernet cables... I would sooner guess an add-on alarm module.
Have you checked in the space between the parking brake and the door? There are several connectors back there, most of them being for the door but there may be one going to the rear. You'll need to remove the kick panel on that wall.
Purple wire in C104 is for the fuel sender per FSM 8A-81-0.
Poring over the component locators in the FSM, I think I remember where C298 is now --- It's above the steering column support. You can't really get to it without tilting the dash down.
I saw the same thing. I didn't see any taped back lead on C104.It does appear that way, like there's two lines that go to C104, but I know for sure it doesn'tin fact, now I'd really like to know where the heck that white wire gets "taped back" after C104, knowing that would have saved me running a new wire all the way from my brake switch to my camper shell CHMSL
... I'm gonna have to look at my truck cuz my wiring from that connector to the rear is still factory for now, I would swear there was no white wire at all in that harness.