Merge Switch and Solenoid

In researching the electrical system our '81 40' coach I
note that the merge switch on the dash is ON-OFF-ON type
rather than ON-OFF. Investigation found a white/orange
wire on the up position contacts and a red/white on the
down position contacts. It was also found there are front
and rear merge solenoids that energize when either ON
position is thrown.

First - Why are there two merge solenoids? Maybe two
separate merge senerios, e.g. house to chassis batteries
when hooked to shore power versus off engine alternator
when running.

Second - What is the correct wiring? According to the
Front Terminal Panel list the White/orange wire is the
Battery Merge and the Red/white wire is the Main Diesel
Tank level.

I wish to compliment all the Newell personnel for a job
well done. My redhead and I bought our '81 coach in '98
after researching the market for about 18 months. We both
were impressed with the quality of the coach and the superb
help of your service, parts, engineering, and office people.

Best Regards

Ki and the 'Redhead'