There is only one plug on a TH400 and has only one or two wires depending upon application. Assuming that you have the correct TH400, all you need to do is plug the wire (s) into the plug on the side of the case.. C3 General - TH400 wiring - On a 71, 350 converted to automatic, (bought that way) No wiring is attached to the transmission. I installed a new engine harness that has connectors to the transmission. Is there a wiring harness for the transmission that connects to the engine harness and if so where can it be purchased..
TH-400 Electric Kickdown Kit Installation Step 1: Remove back cover of the aluminum switch box and remove slide trigger and inner cable.. TH400 Electric Kickdown Kit Installation Instructions Step 7: The tear drop (not included, part of the Lokar Cable Bracket) will be attached to the throttle arm by the hex carb fitting.