I had a chance at the pull a part to get a Uhaul brand wiring harness. It looks like the converter is in the plug. but I think I much rather go with a new one. But I agree a hook up wiring diagram would make things easier or if someone does a nice write up about it. Maybe thats something I can do.

91 Montero LS "Sandstorm", Auto, Dual Bouncy Seats, 2" Suspension lift, 2" Body Lift, GENII front IFS, 32" MT tires

89 Raider "Trailbreaker", 3.0, Auto, Dual Bouncy Seats