Yanmar 3YM20, about four years old, new panel when the engine was installed. Panel has tach with digital hour meter incorporated just below it. Panel also contains ignition switch assembly.
When I pulled into the marina yesterday, I went to record engine hours after shutting down. No readout. Tried again last night, nothing. The meter should run whenever the switch is on. When I turn the switch on, I still have the warning buzzer, but no meter. Tach still runs fine, registers throttle changes as always.
I pulled the panel, as my mechanic said it's just a wire off the switch. All wires coming off the ignition switch (total of 4 or 5) look fine at the ignition switch end - the connections are good, terminals are tightly fastened and uncorroded. At the tach end of those wires, they all disappear into a rectangular plastic plug. I gently pulled on the plug, and it would not come out. I suspect I need to find a release point with a small flat blade screwdriver to get it out.
Here are my questions:
1) Is there anything special about getting that rectangular wiring plug off the back of the tach?
2) When I pull out my voltmeter, what should I be checking? I've not pulled out the technical manual yet, as I am typing this at the library, and my 3 digital copies of the manual are all on the boat.
Any additional troubleshooting ideas are appreciated.
When I pulled into the marina yesterday, I went to record engine hours after shutting down. No readout. Tried again last night, nothing. The meter should run whenever the switch is on. When I turn the switch on, I still have the warning buzzer, but no meter. Tach still runs fine, registers throttle changes as always.
I pulled the panel, as my mechanic said it's just a wire off the switch. All wires coming off the ignition switch (total of 4 or 5) look fine at the ignition switch end - the connections are good, terminals are tightly fastened and uncorroded. At the tach end of those wires, they all disappear into a rectangular plastic plug. I gently pulled on the plug, and it would not come out. I suspect I need to find a release point with a small flat blade screwdriver to get it out.
Here are my questions:
1) Is there anything special about getting that rectangular wiring plug off the back of the tach?
2) When I pull out my voltmeter, what should I be checking? I've not pulled out the technical manual yet, as I am typing this at the library, and my 3 digital copies of the manual are all on the boat.
Any additional troubleshooting ideas are appreciated.
