A few years ago, before my '73 Bus left this planet, it occasionally wouldn't turn over if I'd been hardnosing the highway at high speeds (between Florida's west coast and Virginia or New England in those days) and had pulled over for gas or something.
   All I'd do is make sure it was out of gear and the emergency brake was on, turn the key on, crawl under the back right side behind the wheel with a long screwdriver, and jump two connections on the solenoid. Started right up nearly every time. You'll know the right connections when they spark. I got so good at it I could do it at night without a flashlight.
    I sure do miss that old Bus!
    Don Oldenburg
    McLean, VA