Westerbeke BCGB Remote Connector

I spent some more quality time with various resources last night, and may be getting closer to the end result. I drew out the wiring I have actually found in my BCGTC generator connections, and found an interesting situation that was not obvious from just the notes. The 3 r/v wires coming off the fuse may in fact be going to 2 of the 'other' r/v wires - Monoplex 12v supply and the hour meter. The 3rd is still a mystery. From other runs in the wiring diagrams, it looks like they use r/v for switched power to -many- devices. Could be a standard?
The monoplex r/v wire thought was derived from the 380AC wiring diagrams and that mysterious "remote bypass" switch, which also shows the violet wire from the Systems Monitor connected to that as well. This suggests this wire is feeding power when the genset is running, and illuminates the 'gen on' indicator, although the monoplex needs 12v in order to start the generator, so that muddies the water. My Monoplex has a r/v wire on the 12v connection.
The r/v wire on the hour meter also seems a bit odd, as the default wiring in the genset control has it in parallel with all the other 'run' devices - fuel solenoid, fuel pump, coil, etc, and they all connect to the Run lead on the terminal board (connected to Monoplex Run), but they should be getting power from this connection, not the jumpered wire on the Hour meter.
I'm starting to think that the genset control has been re-wired by Sea Ray to support the Monoplex. Next step on that is to pull the panel out and trace wires looking for deviation from the westerbeke diagram. I know for sure the fuse connection, and hour meter, is different. And open the harness to trace the wires from the genset to the bulkhead. On the wiring diagram there is a note specifically calling out "splice point" on the violet wire for halon to genset wire. Maybe I will find this hidden in the harness?
The 15pin to terminal board diagram in the 380 manual, with dual MDP switches (on & start/stop), turned out to be -very- helpful. I drew up a diagram of it in the same layout as my 370 diagram and was able to correlate every wire by name and function, so now I have the Monoplex to 15pin wiring confirmed. But it does not account for the 3 r/v wires to the fuse, or the wire pair on the hour meter.
Baby steps....
Drawings so far attached.

 

And appears to include genset control mods, too!
It seems I may be the first person to swap out a BCGTC with a BCGB.
Had I put this effort into swapping the 9.6 generator to the BCGB engine (+ governor and crank pulley), I would have been done by now. But I was really liking the 3600 to 1800 rpm change. Plus the plan was to pull the old and insert the new at the same time as the boat has to be moved to get access for a boom. It's a 20+ foot reach into the cabin, and the stern is facing water, 10ft away.

 

The BCGTC westerbeke manual actually notes the switch specifically for Sea Ray and the wire is not part of the harness. The BCGB came from a Chris Craft and has the switch with it's own location in the 15pin connector, suggesting it was a standard feature in this model.

 

I pulled the entire genset control and harness out of the boat, traced wires and found where they tapped into it. They pulled one end of the fuse quick connect off, connected that wire to a 12ga red in the harness to the boat, and the triple r/v wires from the harness to the fuse. And, they moved 1 wire on the circuit breaker to the other terminal of the ckt brkr, which results in the built in charger not being protected by it. It now feeds the battery directly. That change seems to not accomplish any actual purpose, aside from removing the charger protection.
The r/v wire off the hour meter into the harness is still a mystery. Opening the harness to the genset is next.
My Halon 'system', ie cylinder with switch has different colors from the wiring diagram, entirely. It's not mentioned anywhere in my manuals, nor more than in 1 square with 2 wires in the wiring diagram, but if I had a Halon Module, where would I find it? There is a water tight metal box on the stbd stringer next to the batteries, and another inside a panel below the main electrical panels with the anti corrosion modules, and stereo Amp, but that one looks like it has 120v wiring to it and warning stickers to match.
I could just replicate these mods on the BCGB, but that panel has zero room/clearance inside. The 15pin connector has 6 unused locations I could repurpose, but I only bought pins for the connector going to it. Shipping is 15 times the pin cost (0.25 each x6). Ugh

 

Nope, nothing like that at the helm. I think the wiring diagram is misleading.

 

The wires go into the bilge harness above the genset area. I'm going see if I find reference to a blk/grn anywhere in the drawings.
I went through the parts list too, and only found the 300sqft bottle listed. I did notice this description "harness, 400DA-97 gen monoplex ctnl construct " under the "Westerbeke gas 9.0" parts list. The list has the genset listed as a 9.6.
The halon bottle is in the engineroom section under not shown.

 

I have figured out how they spliced into the genset with the wires from the harness, although I can't say I know where any of the wires go in the boat. I'm going to assume for now that since it worked before, it should still work with the BCGB.

The 2 primary changes were to the Fuse/Power, and an addon wire.
Change 1 - The battery wire and the charger wire are connected directly together, instead of through the circuit breaker as originally set up in the BCGTC model. The BCGB is this way by default. The circuit breaker now only protects the fused power to the gen-set control, and the starter solenoid (not fused). There is no obvious reason for having done this, except possibly in the case of the breaker popping, and the battery charger in the gen-set continuing to power the control, and gen-set, with the battery disconnected. This no longer protects the battery on overcurrent from the charger, however.
Change 2 - The circuit breaker was disconnected from the fuse and wires from the harness connected to those 2 points. This puts those wires in series with the power going to the control. This appears to be how they stop the gen-set. All "stop" switches, either inside the gen-set, or in each remote switch does exactly this, cutting off 12v to the control from the fuse.
The Addon wire is perplexing. It is connected to the hot side of the Hour Meter, which is in parallel with every device needed for the gen-set to run: fuel solenoid, fuel pump, coil, powered via the run relay from the fuse. Again, the "stop" switches are all in series with this power to the Relay, and the overspeed circuit, temp & oil pressure switches in the control too. This same connection is also available on 2 pins on the connector, one of which goes to the Monoplex "run indicator". Given that this wire is already available at the monoplex makes this addon connection seem very odd.

Unfortunately it's not getting installed for at least a month, so I won't know for sure it all works, but it's effectively connected the exact same way.

 

Yes, you are 100% correct. I did not elaborate on all that which is between the battery and circuit breaker. The genset charger goes to the circuit breaker, then from the same terminal, to the Battery connection on the solenoid. From there it goes to the disconnect switch, then to the battery (and main charger). The genset charger was connected to the other side of the circuit breaker, as delivered from Westerbeke. ie Change 1 as noted. - Update - this is not correct. Somewhere I was lead to believe that the breaker protected the charging/battery circuit, but it in fact never did. This is as is from the factory.

From there, the 12v passes thru the Circuit Breaker to the fuse & K1 (start) relay. So the circuit breaker protects the genset, K1 (start) relay & monoplex (12v to the boat wiring now). The fuse further protects the control circuits, getting 12v back from the boat wiring. ie Change 2 as noted.

An Open Connection between the 12v to the harness, and 12v return from the harness is the only way to stop the genset now. Or the genset stop switch. On the diagram attached, open the line at the top of the fuse, and connect the 2 boat wires to the open connections. 12v from breaker to supply the power to the harness, and 12v returning to the fuse to supply the control circuit. Opening the connection stops the genset, just like the stop sw below the fuse does.