This topic is quite old and likely forgotten or resolved, but here goes. The Slant-nose has the brass handle of a high current rotary switch protruding from the floor just to the left of the drivers seat. It is an isolation switch fed by the pos. terminal of dual 6 volt (12V) coach batteries that are just behind that seat in an external roll-out compartment.
The other side of the switch feeds a heavy #6-ish cable to the converter / fuse panel, and feeds another cable to the battery boost relay under the engine hood. A smaller cable connects there going to one side of the dual diode battery isolator fed by the alternator. The other side of the boost relay is cabled to the engine battery pos. post., while neg. posts of both batteries are cabled to ground.
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