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Hi Lyle. I am Cam. SO you need to remove part of the dash or roll it to get at this, is that correct?
If you were able to isolate and replace all damaged wiring, then I see no reason that you would need to keep it apart. The concern as always is what was damaged due to the heat beside it. Wiring harnesses I have seen, some require complete dismantling to repair, but again if you found all the damage and replaced it then yes, assemble it.
There is one white wire that grounds at the rear bumper that is the trailer plug ground. There is a white wire that feeds the centre high mount stop light. For the regular rear lights I do not see any others.
Yes, the ground wire goes directly to frame. Could this white wire be in fact an old yellow that's discoloured?
The schematics don't show a white then that size to the back. Does it get power with the key on? All the time?