Jensen InCommand Generator Cranking

[The Veteran RVR]

2016 3720 gen ready Legacy package. I just installed a 2006 Marquis Gold 5500 gas. Works perfectly. Only problem is the Jensen InCommand will not continually crank the generator when I press the 'start' button. It only cranks for about 1 second whether I hold it or just press and let go. I'm not even sure the prime button works. Stop button works. The gas tank is a portable 6-gallon, so the meter reads 000. I've reset the InCommand to no avail. The previous owner looked at the remote cable and stated something about 1 wire missing...but I wasn't listening too closely. Anyone have a clue? T.I.A.

[ChuckS]

Have you checked the OEM wire harness for good continuity from BCM to control panel on the Onan?

Pics are what should be correct wiring from BCM with color codes on OEM harness to the generator control panel