Columbia ParCar 2ED - E1 Wiring Diagram/Error Code 2-3 Reverse Buzzer

[Tlucido]

I purchased an 2WD electric 48V parcar from a kid who had done some janky wiring that I am trying to undo. This thing used to work well, until I sprayed it down with a powerwasher then lost all power. I replaced the controller and solenoid and have all new batteries. The new controller is the Navitas TSX3 and it’s a direct plug a play. I’m getting an error code for the reverse buzzer. It says to check for a short on the reverse buzzer wiring. The reverse buzzer was not hooked up previously. While looking for this short I’m trying to check all the wiring from the harness to make sure it’s all going to the correct spots, and I could really use a wiring harness picture that shows all of the terminals and where they are supposed to go. I’m not great at reading the electrical diagrams, and would love a pic of the harness with corresponding notes on where they should be plugged in. I have also been having a hard time finding the exact wiring diagram for my model of par car.

[Tech Support]

What year is the vehicle? Last two digits of VIN will tell us. If it still has the original harness, the wiring is in the parts manual. They didn't start using the Sevcon until about 2004ish so a Navitas conversion most likely didn't happen before then.