Napa ST81 Solenoid For 621

(quoted from post at 20:21:30 03/22/19) Made a special trip to get a solenoid for a Ford 621, 12 volt, gas engine. The old solenoid was sticking. It was the one that the ignition switch must be on to activate the starter and a working safety starter button.
To make the story short the new ST81 will not work. I have the battery cable going to the right side, a live wire coming from the terminal block when the switch is on to the ignition terminal on the solenoid and a wire going from the starter terminal on the solenoid to the starter button. I have good grounds on the solenoid and the starter button.
I disassembled the old solenoid and cleaned up the disk and now it works great. I doubt that Napa will take it back because I had it on the tractor. I really would to replace the old solenoid. I am beginning to doubt Napa's quality parts.

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(quoted from post at 00:15:04 03/23/19)

(quoted from post at 20:21:30 03/22/19) Made a special trip to get a solenoid for a Ford 621, 12 volt, gas engine. The old solenoid was sticking. It was the one that the ignition switch must be on to activate the starter and a working safety starter button.
To make the story short the new ST81 will not work. I have the battery cable going to the right side, a live wire coming from the terminal block when the switch is on to the ignition terminal on the solenoid and a wire going from the starter terminal on the solenoid to the starter button. I have good grounds on the solenoid and the starter button.
I disassembled the old solenoid and cleaned up the disk and now it works great. I doubt that Napa will take it back because I had it on the tractor. I really would to replace the old solenoid. I am beginning to doubt Napa's quality parts.

Click to expand...

I think this is what you are looking for, I have used this setup on 8N's to make them so they won't crank unless the keyed ignition switch is "ON".

It's a "Standard Ignition" (SMP) part number, but any auto parts store should be able to cross that SMP number to the brand they carry.

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