Thought y'all might like to know.. after much wrestling, I've changed the starter.. I got the old one to the point where the solenoid would click in, but it wouldn't turn. That was an almost completely rusted-away live feed from the battery.
It still only turns over about one in three times.. I figure that's probably the relay.. BUT.. after cleaning the rotor arm, coil connections, and the spark plugs.. it starts!
Only on starting fluid, mind. One step at a time.
