Update:
I pulled the motor off the truck last night. I test for voltage at the
harness with the switch on, and I got a reading. On this wiper motor
is a little module with 5 spade slots that plug into the motor just
above where the harness connects. I took that off, and plugged the
motor back in and the motor works if I manually ground one of the
spades.
On the motor body, there are 4 spades for the harness, lined up like
this: | | | | and checking continuity against a 5th spade the module
plugs into, the outer two have continuity with the 5th one, and the
inner two with each other only. Since the module snaps onto all 5, I
imagine it is acting kind of like a bus and distributing power to the
other connections. Testing continuity on this module fails, none of
the slots have continuity with each other which I would expect if
that's what it is doing.
I think this may be a noise suppression module, inside are what look
like cylindrical capacitors, the only marking I can make out on one is
250v and MAC.
Anyway, heading to the wrecking yard in a bit as the module is not
available without a new motor. And I'm too cheap for that, especially
since the motor works ;)
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