What are you hooking it to ? The polarity is critical here is a factory hookup
Faron, are you certain about the white wire going to the S post of the solenoid? I have a Duraspark distributor and blue module on my 59s 428, and I had the white wire connected to the I terminal. Today, I switched the white wire to the S terminal, and once the engine started to crank over, and the engine started, the starter was still cranking. Even with the key turned off, the engine kept cranking, until I unhooked the white wire from the S terminal. I put it back to the I stud, and everything was back to normal.