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To shed some light on the oil pressure switch causing the no crank issue the switch opens with oil pressure opening the ground for the starter relay. The end of the ground wire is fastened to the ground on the generator. Typically the switches fail and prevent cranking. Jump the two pins on the...

Model ID Is yours an A1 or A0? The electrical is different between the two, and will make a difference in the diagnostics. an A0 will have a 3116 mechanical CAT and the A1 will have the 3126 Electronic controlled engine.

The A0 trucks with the 3116 cat were the only ones to have the start interrupt switch. I'm not sure of the serial number range of your truck, which is important in some aspects of wiring. Does your truck have the DRIC (dual relay interconnect)? You could connect the wiring directly to the...

That is an EMI filter to prevent electroagnetic interference from affecting the ecu. Battery power to the ecu runs through the filter. There was a harness that was made to bypass the filter that I think was part of an MWO. Later on the filter was omitted from production.