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How to Wire a 4-Terminal Solenoid That Replaced a 3-Terminal Solenoid  

Question:

On a four post solenoid as a replacement for a three post one I hooked my starter wire to the one marked with S and nothing to the I side and the battery wire to the right side and the starter wire to the left post, this on an old Ford tractor I was assured this would work. Have I missed something, it did not do anything. it had a good ground

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Expert Reply:

A 4-terminal starter solenoid like the Pollak # PK5230701 needs to be wired so that the 12V power in/out is connected to the two larger terminals while the two smaller terminals are connected to ground and an ignition source. A 3-terminal solenoid grounds through the hardware so if you didn't run a wire for ground to the 4-terminal solenoid then that is your issue.

If this doesn't fix your problem let me know what solenoid you are using and if we carry it I can reach out to the manufacturer for any other recommendations.

expert reply by:
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Jon G

Marcop

8/13/2020

Thanks Jon G. Following your advice I was able to fix my solenoid problem.

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