ezgo troubleshooting

I purchased a 1999 EZGO 36v DCS with a 300amp 9 pin controller and a series motor. The controller had blown resistors internally and the motor was unspooled internally. I have installed a brand new 1206 sx 9 pin controller, a new series motor, and a new solenoid. After all of this the cart...

NEED HELP! New here and no nothing about carts, I have a 95 Medalist, was a working golf cart but melted F/R switch, so I replaced worked for 2 weeks melted again, did some troubleshooting and decided just to replace everything. Motor, solenoid, f/r switch, battery cables and added voltage...

Can anyone tell me what this unknown part is? And where I can find a replacement? It is off of a 1980's EZGO Marathon golf cart.

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