twistedtree
Guru
One of the wires to the alternator is typically an "ignition" wire. It goes active when you key-on the engine, and turns on the regulator in the alternator. Next step I would try to figure out which wire that is, and check with a meter to see if it's turning on when you key-on the engine.
A seafire would typically interrupt the ignition for the engine, thereby shutting it down. I could see how that would also kill the Ignition signal to the alternator, but I think it would be odd for it to only kill the alternator ignition signal without also killing the engine.
Any chance of a clear, well lit picture of the wiring connections to the alternator? I have zero experience with Yanmars so don't know what's typical.
A seafire would typically interrupt the ignition for the engine, thereby shutting it down. I could see how that would also kill the Ignition signal to the alternator, but I think it would be odd for it to only kill the alternator ignition signal without also killing the engine.
Any chance of a clear, well lit picture of the wiring connections to the alternator? I have zero experience with Yanmars so don't know what's typical.