I wrote:

But run [F250] until it get thoroughly warmed up, shut it off, and it
behaves as if it had a nearly dead battery: a-WUMP a-WUMP a-wump
aaaa clickety-click. Let it sit for 10 to 20 minutes (depending
on the outdoor temp) and it fires right up again. PITA at gas
stations.


"Stormin Mormon" writes:

Please list some of the things you tried, or replaced.

Ha. Starter motor, fender-mounted solenoid/relay, battery and (for
other reasons) the alternator & belt.

Haven't replaced the cables, all of which appear clean and well
connected but not (See Mike Terrell's post) oversized. Haven't
replace the in-tank electric fuel pump or other fuel components or
sensors.

Folks in another venue have suggested overheating of the starter motor
itself by the nearby exhaust manifold. I haven't figured out how to
cobble up a heat shield yet. (Getting a little old, stiff and creaky
for crawling around under a truck, don'tcha know?)

Other posts saved for thinking about, thank y'all.

--
Mike Spencer Nova Scotia, Canada