Wow == the guys are right the six screws on the control card are your TB inputs & outputs that is a simple truck to work on.
TB1 should have batt volts also 2 & 3 & 4 you can make a jumper wire from 2-3 this is usually all your brake switches etc - when you have power at these pionts 5& 6 which are fwd & rev should come in when control handle is moved check all of the 15 amp glass fuses on the top right hand side of door panel above platform
Post your results & we will go from there
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