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I’ll revisit the harness and check it out, I hope to still find the root cause. I’m hopeful the root cause.

Update: I changed the engine wiring harness and used ECU from my parts motor. Relay closes and medium pressure pumps primes and motor starts & runs. Thanks for the feedback and help. I appreciate it.

I had 12v at starter solenoid to ground on powerhead. I checked and cleaned battery ground and engine grounds that were accessible. I agree with you on swapping the ecu could be risky if there was an issue that fried the ecu, but in this case I couldn’t start the motor without jumping the fuel...

Fuses were good, ignition switch was good, Relay was not closing with key on. I was only getting 2v on double red wires w yellow strip that the red wire from the fuel pump plugs into. I stopped troubleshooting when I had 12v to yellow wire at engine wire harness. Troubleshooting the harness on...

I have 02 Yamaha HPDI twin on my offshore 24, when I key on port motor, relay does not click, medium pressure pump does not run. I have known good relays and fuses. Any suggestions?