Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
The charger comes on when connected to the cart? Year model of the cart? does it have the same controller as the other cart you are comparing it to? The Field terminals on the drive motor has to vary voltage they can be marked, S 1 and S 2 or F1 and F2, but either way , they are the field coils.
Its some work to do it, but the likely problem is the controller, but swapping them would tell the tale. Has to be the foot ITS switch or the controller.
The 03 makes it 2003.
I'm thinking the foot switch may be faulty.
You know it is not the controller, and the solenid will not do this, and the typical forward /reverse switch only affects one direction. So that leaves the ITS switch(foot switch) and the drive motor. There is Ezgo troubleshooting, which has test for both. Here is link below, you will need to scroll down the opening page past the manuals to get to the troubleshooting and the ITS test and the drive motor test.