[1LowToy]

Example 1 is closer to meeting the needs. This solinoid is used when everything is good and it just won't start at times.

The idea behind this is to give good amperage to the S terminal on the Bendix solinoid on the starter. If you think of it the Bendix Solinoid on the starter is an electro-magnet. It takes a good amount of amperage to get the solinoid to react, and sometimes more than the Chevy harness can deliver. So by adding the Ford solinoid it can deliver plenty of amps to make the Bendix electro magnet operate.

10 gauge wire from battery or battery terminal at the starter (no need for both battery and starter hot wire), to the Ford solinoid.
10 gauge wire from the other large post of the Ford solinoid to the S terminal on the starter.

Wire from ignition switch (formerly the wire going to the S terminal on the Bendix solinoid on the starter) to the S terminal on the Ford Starter.

We used to put these on 6V VWs years ago.