Thank you, Chuck, for the information and for correcting my terminology! I am anything but an RV technician, but I'm on a steep learning curve.
The RV is stored about 20 minutes from here so I can't directly answer your question about how many wires are on the step well switch. I can say that there are two switches on the panel labeled "Battery disconnects." One switch is labeled "coach" and the other is labeled "chassis." It seems likely that the loose wire should connect to the "chassis" switch because of the ignition and dashboard failures. There are quite a few wires attached to the back of each switch - I'm guessing 6 or 7 wires on each switch.
I've forwarded your information to my brother-in-law. He's done RV repairs for many years and that's his business. However, he lives in CA and I live in OR, so we're about 650 miles apart from each other. I'm sure he will use the information you sent and see if he can figure out what to do. Again, thank you!
-Jim
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