The wiring is pretty standard, when tracing this down symptom drive what I am looking for. You can take tender and enigne shell off and plug in harness. Trace for continuity from the harness connections in the tender to the pcb on back of engine. Gray 5V, blue PCB ground and Purple HL signal from the Tender MUX are the must haves to the engine mux for lights to work, and also smoke and tach. So if they were good, it is not the tender harness but rather the wires from the engine pcb up to the shell/engine MUX. Can't be any other way. The mux also get Yel/Wht motor lead from engine side to generate PV on the mux for lights and smoke heat. Many wire joints and connections between engine PCB and the engine mux, and plenty from mux to the features. G
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