Help on my electric truck
 

I got my truck on the road the other day. But the coupling broke to the transmission, and when that happen i burnt the hot wire that comes off the 12volt battery that goes to dc/dc converter and to the switch for turning on the contactor and burn up the switch also. I replace the contactor and the switch. But when i step on the gas petal the light that goes for turning on the capastors in the controller comes on and the motor turns a little bit then stops. What did i do? And what di i need to check? And fix? Thanks