Inverter, how I hate thee

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Looks like I found the culprit. The kill-switch to inverter node was loose, had a nice amount of salt and road residue mixed in to the grease, and the vibrations from the truck appear to have broken the bolt attaching the ground wire to the chassis. Fml.

 

Just to update this topic on my semi-annual day off: The fix was a lot more involved than I had at first thought and required a bit of effort. In addition to this problem, my dog took the opportunity to chew through the airline on the driver's seat causing it to hemorrhage air and sink to the floor.

The low voltage shut-off required all three screws to be drilled out and refitted with some self-tapping screws and once grounded, has thenceforth operated without a hiccough. Admittedly, the air line presented a more pressing issue and natural to my character, I overestimated the difficulty of repairing it. Initially, I attempted toe everyman's solution of wrapping it in duct tape which proved not only ineffective, but required a fair amount of effort to fully remove the residue; my thanks to Goo Gone. Discovering that duct tape would not hold up to a pressurized air line, I applied some heat shrink and found that wouldn't work either. At this point I began to worry that the problem would not have an easy solution after all until deciding to simply cut the hose shorter and removing some of the zip ties running the line through the seat to lengthen it, which in retrospect seems like the most common sense approach. Worked like a charm. Funny how big problems don't always require big solutions.

Edit: I should also mention that the reason only 3 screws were used rather than 4, was that due to the installation point of the kill switch, the bottom right-hand screw would have punctured one of my air compressor reservoirs.