Not sure why they would say that the OBC is preventing it from running. It will prevent it from charging....
And you bypass the OBC by running a jumper from the back side of the charge receptacle (where the black 10g wire is that goes into the harness) and run it directly to the Main Pack Negative. Also take the grey sense wire coming off the same receptacle and land it to the same place. This will allow the charger to turn on "if" the OBC has failed. Note- This is only to test and not to make normal operation.
And the lockout circuit bypassed for testing by disconnecting the 6-pin connector from the OBC and install a jumper or metal paper clip between the white wire and the blue wire on the cart's harness side connector. (Insulate it if you are going to leave it that way or look at the stickys and there are directions for cutting off the other side and making a jumper plug.)
And if you did not have the low (Neg) at the solenoid via the blue/white wire, then when you jumped that small post to the Main Neg at the pack or B- controller and it closed in (clicked) but would not run, then either your solenoid is bad internally or the controller is bad. You need to check the voltage on the 2 big post before and after solenoid closure to insure it is occurring.
Before assuming any of this, you need to make sure you tested everything correctly or the conclusion will be false...