The battery merge switch seems to be wired to a solenoid in the rear electrical compartment on my 77 coach. THe two positions on the switch on the driver's panel allows you to choose which battery, house or chassis, the solenoid will be powered by. This way if one set of batteries is dead you can still actuate the solenoid to join all batteries and hopefully charge the dead batteries. Without this feature there would be no way to actuate the solenoid if it was only powered by one set of batteries and that set was dead.
My 77 coach has the override switch and it originally had a Cummins 555 though now it has a 6V92T.
Regarding the DC amps gauge on the driver's panel. I believe mine is wired to the engine batteries since it rises right after starting and then reduces gradually regardless of what I turn on or off in the coach.
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