The safest way is to jack the rear wheels off the ground and put on jack-stands while troubleshooting so the half ton cart doesn't take off unexpectedly and run over someone or something.
When charger is unplugged from cart, key is ON, F/R is in F, does the solenoid click when throttle pedal is pushed?
If not, attach your DVM's negative test lead to the main negative terminal on battery pack (shown in first attached drawing) and measure the voltage on the small white wire coming out of the charger port that connects to the red wire going into the wiring harness. (shown in second attached drawing)
You should have battery pack voltage at that point. If not either the REED switch is bad, or the fuse in the big white wire going to the main positive terminal is bad, or the wire is bad.
If you get voltage on the small white wire, check for voltage at MS-2 on the F/R assembly.
From there it goes to the Keyswitch and then on the the Pedal microswitch (MS-3) and finally to the solenoid coil terminal.
You doe have some battery and charger issues, but you ought to have enough pack voltage to get the solenoid to click when pedal is pushed.
If you can get the solenoid to click and the wheels do not turn when they are off the ground, more troubleshooting is needed.
Also, to find out what your cart was when it rolled out of the factory, eneter the serial number on this website. (It also shows you where to find serial#)
http://www.shopezgo.com/customer-ser...ialNumber.html