here after much Googlage to no avail. A few weeks ago, at about 5 AM, my outside helm engine
panel (B-type) started shrieking. While I continued snoozing happily, dock
neighbors came aboard and duct-taped over the Sonalert to shave a few annoying decibels... and once I flickered to life, we spent the day trying to find the problem. Despite turning up a few flaky connectors down in the engine
compartment, we failed to figure out why the outside helm
spontaneously had both 12V and a ground from one of the sensors.
Before digging further, I decided to move this to the top of the reverse-engineering priority list (I'm doing an 11x17 book of drawings for all boat systems, starting with existing stuff). I have the Yanmar service
manual with the schematics for both types of panels
(D-type in the pilot house and B-type at the helm, with a Y-cable laying under the engine that's probably the source of the problem), but am currently frustrated by a lack of information about the logic of the starter switch. This seems like a very silly question, but their schematic is rather inscrutable regarding what gets connected to what, and when. Some of the other devices, as well, are not shown functionally in their drawing... just wire colors boxes, some obvious, some not.
I'm doing a full schematic to current
standards, which I'll be happy to share with y'all, but before I do, I want to be sure I'm not reinventing any wheels. Has anyone created a clear drawing of the Yanmar electrical system
(or at least made a table that shows what interconnects correlate with the glow-off-on-start switch positions)? Debugging would be SO much easier...