Re: Starting problem
Any other symptoms? Does it happen when it's dry as well as damp (when raining or afterwards)?
Could be it needs new plug wires or they're just damp after it rains. You could try spraying the wires
with a drying agent like WD40 or some other drying agent you can usually get at an auto parts place.
If the wires look worn, might be worth replacing them. They can appear to be electrically conductive
when checked with a meter, but may be leaking voltage when you try to start the beast.
Another possible is does it happen when the engine is cold, or after it's been running a while and
warmed up? If it's the latter, check that the battery ground wire to the starter motor( you may have
to get down under the engine to reach it) isn't loosening after the starter motor casing heats and
cools a few times. I had a 1970s Ford that had that problem. Started fine when cold, but if I turned
it off after heating it up, sometimes the ground wire loosened and it wouldn't start. If it is that, you
can add a locking nut to the system to help prevent loosening after heat/cold cycles.
I'm no mechanic, just some anecdotal experiences with (Ford) vehicles not starting. May apply, may not.
It's not a sprint(er) (unless you make it one), it's (hopefully) a marathon.
RV - 2018 Navion 24V + 2016 Wrangler JKU