Hi Fred,
pls confirm if your truck is DC or AC (and age of machine). i assume your machine is a DC truck.
For FE78 we have two possibilities:
1. Voltage potential on -x10:1 and -x10:30 before machine is switched on - check for +ve voltage at these terminals. If voltage present remove -x10 plug and recheck at plug/harness.
2. If there is no voltage potential present = faulty LAS PCB k1 is welded / faulty
Rgds
J
2.
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