Tail light /trailer-tow/chassis wiring harness questions

QuercusRubra

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Happy holidays, folks... I'm restoring a '99.5 F550 7.3 Powerstroke 4x4 165" chassis cab

I'm to the point where I have about 12 or so wires going to the rear, I'm wondering if any one can tell me what they're supposed to be? Some do nothing so far but may be trailer/tow wires that aren't hooked up yet. If I knew who wires were supposed to be, it would be easier to debug them. Three of them have a splice into two or three wires at the tail end.

In debugging this, I found three plugs together above the front driver's side wheel that seem to connect the chassis harness into the cab. It looks like maybe one is for the tail light wires, one for the trailer/tow wires and one for the other stuff like fuel pump, reverse and to case switch, etc. Can any one confirm this?

Can anyone suggest which wire or which pin in these plugs is for reverse lights? I had problems with them and I haven't found them in the wiring yet.

Thanks in advance!

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