I may try that. Are you running a dsp2 on yours? If so when you flip the plug over so you are looking at the back and the wires run to the right its the second row up and the 4th pin from the right (next to the yellow/black wire). It just goes in there into the abyss. The only thing Im having the kid check with rob is if the grey wire for some reason may be the ground before I go cutting anything. My DSP2 switch is grounded in the cab as well with no trouble. Ive done quite a few and never had any problem and felt it was kind of stupid to have an issue with something so simple. But apparently im not as dumb as I thought
Also yes used EFI for the dsp2 option it just says yes or no. It doesnt have a voltage readout for the dsp2 only the dsp5. But i tried that anyway and it just read no. also the dsp2 tune is supposed to be a smoke tune with a 3900pw down low and it doesnt smoke a bit so i know its not working.