This e motor was recently donated to the Bike Exchange. I am trying to determine how to connect the charger to the controller.

Pictured are 3 wire/ connector units, large red/black, small red/ black , small green/red/black, and a black plug connected to the charger with a red(with fuse) and a yellow/green stripe wire plus one prong on what looks like a plug end that has no wire connected to it.

Can anyone tell me what the proper connections should be.

The long wires in the battery bokx connect to the wiring harness . I assume one goes to the red connector on one battery and the other goes to the black connector on the third battery with 2 jumpers(not shown) that connect bat1 to 2 and 2 to 3.