A friends 309 recently had something go south and need to replace the wiring harness on his engine as well as the wiring that goes up to his engine control panel in the cockpit. Have no idea what failed but the smoke demons definitely got out. He has a 3YM20 Yanmar engine and it appears the wiring harness is easy to find, but that is only for the engine. How do I find out which one he needs? Is it based on the model of engine control panel?