'03 Yamaha 250 HPDI no start

[shsnyderjr]

I have a pair of '03 250 HPDI motors on a boat in our shop that that will only run while cranking. They immediately shut down when the key switch is backed off to the run position. I have verified continuity at the key switch harness between the pink an red wires while the switch is in the run position. I have also verified continuity between the brown and red wires in crank position. The kill switch which is common to both motors has also checked out OK. I am really puzzled as to what possible common link these motors share that would cause this problem. Any suggestions? Thanks for your help.
Sam

[Sequoiha]

sounds like you are losing the 12v run signal to the main power relay when you release the key. in this instance a continuity test only tells you that there is continuity, 1 strand of 1 wire can give you this result,, sounds like a bad keyswitch to me.. try plugging in another one, even if it is single key switch, it would be a good starting point, the only thing both engines have in common is the dual panel key switch..