On Tuesday, August 14, 2018 at 6:49:35 PM UTC-4, Arlen Holder wrote:
On 14 Aug 2018 15:08:57 GMT, dpb wrote:

Well, that won't generate anything close to 65 psi; more like 25-30 at 1
psi/2.3 ft head.

The pressure is coming from the tank bladder airfill that should be
about 68 psi if the cutoff is 70 psi -- which just about matches
observation.

Thanks for running that calculation.

The only thing left to troubleshoot now that the system is figured out is
the voltage on the pressure switch when it's supposed to go on.

Right now, moments ago, when it was in the static pressurized state, it had
120VAC on each input black lead and essentially noise on the two blue leads
to the motor (all to the green common ground).
http://www.bild.me/bild.php?file=1169657flow04.jpg

Do you know if there is a way to bypass the pressure switch without
jumpers? It's not important if there isn't a way to test it manually.
http://www.bild.me/bild.php?file=7459999flow03.jpg

I'll just shut the electricity or let the irrigation run for a while until
the booster is forced to turn back on. When the booster turns back on, I'll
test the voltage. If it doesn't turn back on, I'll test the voltage.

I don't think I will have anything to report until I run that test.

BTW, since you're interested in what you really have there, it's a jet pump, but it's being used like a conventional pump. The second connection for the pressure side pipe that would normally go down the well isn't used.