The original solenoid has one end of the solenoid winding connected to one of the big BAT posts. The small terminal connects to the other end of the solenoid winding and completes the circuit when you ground that small terminal through the button switch.
When you install one of those "ground to activate" solenoids, make sure you connect the battery cable to the solenoid post marked "BAT", that is the one with the solenoid winding connected to it. If you acidently switch the battery and starter connections, the solenoid will not function.
I repowered a 48 model F6 with a modern 12V engine and wanted to keep the starter solenoid with the extra terminal for the ignition resistor bypass. I made it work with the original grounding button switch by mounting the solenoid base on an insulated wood block on the firewall. I jumpered the small "S" post to the big "BAT" post and connected the Starter button wire to the foot of the solenoid. It worked great with the grounding starter button and I had the "hot start terminal for better starting ignition.
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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