OK this is going to seem farfetched but we had very similar problems with our 93 HR. Turned out to be the ignition switch and dash wiring harness. The dash panels are easy to remove. While looking for the problem i found a harness connection with a boatload of wires. I pulled the harness apart and the male and female spade connectors inside were coated with green crap. Was a pain to replace but I found an identical wiring harness at a local auto parts store. I soldered all the wiring connections and covered them with heat shrink tubing. Been working properly since the repair.
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Harris
1993-37' Holiday Rambler Imperial
2018 motor, radiator, much more
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