Stepside bed rear wiring routing?

[jcwren]

(sorry, no pictures yet). On a '70 LWB stepside, how are the wires routed from the brake lights and back-up lights to the 4-pin frame connector? On both sides, there is a 2-pin connector to disconnect the brake lights, and a single pin connector to disconnect the back-up lights. The design of the 2-pin connectors make it look like they should snap into something, much like the 4-pin connector snaps into the frame.

I bought the truck as a partial restoration, and the harness was present, but not installed. This isn't a case of I took it apart and I forget how it goes back together (Thank Dog for cellphones!)

Any pictures or good descriptions of how I should route and dress the wiring on her backend?

Thanks,
--jc