Join Date: Jul 2000
Thanked 235 Times in 222 Posts
Rep Power: 18
Re: Yanmar 1GM10 won't start
Yanmar engines are NOTORIOUS for failing to start ... usually caused by corrosion in the primary circuit wiring of the starter solenoid circuit and most often corrosion in the wiring of the in-line FUSE holder that protects this circuit; but, can also be carbon build-up in the starter button switch, etc.
How to test: find/identify the battery lead from the battery that connects to the STARTER. Take an old screwdriver and 'short'/jump the Batt terminal on the starter to the center connection on the solenoid. Make sure your necktie and clothing dont get 'wrapped up' in the engine vee belts when youre leaning over the engine when 'jumping' the starter/solenoid!!!! If this engages the solenoid and the starter turns freely and with power .... repair the solenoid primary wiring circuit - keyswitch, starter button, FUSE holder, and all the connections between the starter switch and the solenoid.
Yanmar still uses non-tinned wire, non-tinned connectors and non-tinned switching components in their engine control panels, which are readily subject to corrosion (corrosion leads to high resistance and HIGH amperage draw) .... best is to 'rip it all out' and replace with TINNED wiring and components.