Help with reverse light wiring for '72 3 on the floor

[Explorer4Hire]

Hey... really getting frustrated today. Early 72.... I cant get the reverse wiring down. I have a red wire with a blue stripe.... it crosses over to the passenger side, goes forward with harness bundle... and thats it. There is no bullet connection for the switch on top of the trans. Those wires are just cooling out up there. The only connections I have are for white/black wire and green/yellow wire. I think those are for the transfer switch which activates the green light on the dash (also not working yet as I cant locate the transfer indicator switch yet). Anyway, the only other wiring I see are two green/red stripe wires that are up on the driver's side hanging out near the voltage regulator part of the harness... I am stuck on this one...
anyone with a 3 on the floor out there know how yours is wired up? Thanks!

 

[nabbasi]

The Red with blue (RL) is the correct wire. It shares a circuit with your heater.

Coming out of the fuse panel, the RL wire goes under the dash then out the firewall. The firewall has 2 plugs on the passenger side that connect to the rear chassis harness. The RL goes under the truck, then up to the transmission. (The rear lights, fuel sending unit (YR) and the transfer case switch wires are all running with it).

The reverse light switch is threaded into the back of the shifter housing (might be what you’re seeing?). Its pigtail should have 2 bullet connectors. One that feeds 12V+ from the fuse panel, and when reverse is engaged, it sends 12V+ through to the RL that goes to the reverse light.