Using a portable drill with wire brush, rust remover/converter spray, degreaser, and high temp paint, I have finally got much of it looking pretty good. Almost everything from the propane tank to transmission to the exhaust, from inside front bumper and chassis to coil springs to driveshaft to rear axle, all now clean, rust free and protected with new silver, grey and black paint. (Still have the engine and far rear chassis to work on.). I use leveling blocks to raise the whole thing a couple of inches which helps a lot when underneath, as does a work lamp.
Anyway, so I got towards the right rear and saw some of the ground connections, which are on my todo list.
In the photo below, at the lower left is the generator ground, and the upper right are the grounds for most of the electrical panel and converter. (This was taken after washing nearby, that's why it's all wet.). Remember, I'm a '94, so yours will vary. Since the generator has been slow to start at times (it doesn't quite reach the RPMs required), and its ground used a big 1/2" nut, I went for it first. The nut quickly came loose with a socket and began to unscrew off, but then after a few tight turns it suddenly starting turning TOO easily.
To my horror, the nut and the bolt inside the chassis rail that it threads onto, were now turning together! Arrgh. Now I was worse off than ever, with a partially undone ground, and seemingly no way to tighten or remove.
Long story short, fortunately the back end of that chassis box rail is open, and I was able to jam in a long crescent wrench to keep the bolt from turning while I removed the nut, wire brushed clean the rail and ground cable, and put it back together. Then I covered it all with clear Rustoleum spray.
Good news is that now the generator cranks a tiny bit faster and thus starts nearly instantly.
Bad news is that now I'm fearful of messing with those other grounds, as there's no way to reach behind them inside the rail. Does anyone know if they are simply screws into the rail, with nothing inside? I think they are, but you know how it goes: once bitten, twice wary
