What is the issue? Harness is bad for rubbing under control handle. Switches at base of control handle often fail or bracket gets bent.
Easy to remove handle assembly with 3 screws. Wires chafe as it pivots and touch frame. 
What are the issues with the truck? 
Numero uno problem is batteries. One fails and the truck may not even pass self test, then shuts off.
    
    
    
 
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