Is the "coach" switch the Boost switch on the dash or the "store/use" switch?
do you have a chassis battery disconnect switch and did it work prior to removing the 2 switches?
I doubt the transfer switch is involved in this issue.
If you suspect that the solenoid is stuck:
Remove the two control wires from the solenoid (2 small wires)
Use a meter or 12 volt test light to check for power on both the in and out sides of the solenoid. If you have 12 volts both sides with the control wires removed, the contacts are likely stuck/welded.
When testing with meter or light, put one tester lead/wire to chassis ground and the other tester lead/wire to the wire on the solenoid.
If , by chance, the switch wires got swapped when moving them ,the solenoid could have 12 volts on the control wires all the time regardless of switch position.
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1998 Min Winnie, 2000 Winbago Journey, 2015 ACE 29.3
2016 Thor Miramar 34.2
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