My friend is on day two of a road trip with a 1985 Itasca Sunflyer RV. The original Chevy 454 engine was replaced with a 350. It was all checked out and tuned up by a mechanic friend before they left and has been running great. Yesterday after stopping at a gas station, it wouldn’t start on the first try (just one click, no turn over), but on the second try it started up and ran fine. Today the same scenario, but after an hour of trying, it still won’t turn over, just one click each time the key is turned. There’s still power in the RV, so it’s not the power, right? Seems like it’s probably something really simple, but they called a local mechanic who said he’d charge $400 just to come out and look at it, and that’s not including repairs! Any ideas what it could be, or what they could try? My friend’s in a wheelchair, so it’s a very frustrating situation.