oldboat1 I have ohm tested the harness, and the stop circuit is shorted to ground in it. It started with a no start, I unplugged the boat harness (red connector) and crank with jumper box and it started. I went to the key switch next as that is the usual suspect, unplugged it and ohmed the black/yellow and it was grounded. Inspected the engine end and found this adapter harness in between the engine and the boat harness. Pulled the side cover and removed it, ohmed the stop circuit to the ground and found the short.
This is a weird adapter, I've never seen one like it before, and I've worked on a lot of different boats. My guess is that Sylvan sends their pontoons with a harness, and the dealer then adds an adapter or the engine they install. CDI does have one that is close, but no exact. I might email them a pic and see if they can help.
I red connector on the engine splits off and connects to 3 Weather PAC connectors, I wonder if I can change that out to match the boat harness?
