Paul, I had the same issue, brand new 150d motor with the adapter cable. It ended up being the key switch. For some reason the key switch on my 150a wouldn’t start the new motor. I happened to have another key switch that I changed out because the lights burned out and I hooked it up and the...
Installed new Honda bf150d hooked up adapter cable and when you turn the key to on position the top two engine lights are flashing and alarm beeping with the flashes. Any one have a clue?