We know most of our mechanical/electrical problems are mysteries and I may or may not have solved a recurring mystery.
I have been working with DC power systems and diesel engines for years. Made good money working out their problems. I have always worked with two basic premises. If your DC systems is doing weird things, you probably have a bad ground and if your diesel engine is spitting, sputtering and dying, the most likely solution is a plugged fuel filter.
Of course these are only likely solutions and lots of other stuff could be the problem.
Now for what brought me to write this. We have owned our MH 21/2 years and 20,000 miles. It has done well for us, mostly, and we have had a lot of fun but also a few problems.
I have had a run of ground problems at the dash which were quickly cured and several partially plugged fuel filters.
On our trip to Yellowstone this spring, I had several warning lights, weird codes on the Scan Gauge D and a ruff running engine after leaving Cody en route to Yellowstone Lake. In the middle of Yellowstone is a bad place to break down. No cell phone coverage and small shoulders.
Because of the electrical problem indications, I assumed the problem was electrical. Couldn't find a solution. Headed downhill to Jackson Hole at speeds down to 5 MPH. Sure irritates the other motorist. Made it to Jackson Hole but couldn't find any help. Took off for Rock Springs, WY. Made it as far as a nice little campground at Boulder, WY. Snow & rain while troubleshooting. Saw my spare fuel filter and "what the hell". replaced the old one that was only 20 days and 1500 miles old.
Next day we headed south and home in OKlahoma. No more problems. New filter seamed to solve the problem.
Now leaving for CA next week so wanted new filters. Replaced the secondary on the engine and moved to the primary. Looking in the driver side compartment behind the drive wheels, the filter was easily seen and worked on
but tucked up against the filter are two bunches of white (ground on Monaco) wires bolted to the frame. These wires have to be pushed around a bit to install the filter. After installing the new filter I removed the ground cables. They were rusty, cruddy, and didn't look good. Now they are clean and pretty.
So, was wiggling the ground wires while changing the filter, or the new filter, the cure? Of course now, if the problem doesn't return, I will never know if the problem was ground or fuel.
This discourse is probably no help to anyone, but I feel better for having spelled it all out.