Starter Relay

Having my local guy test today or tomorrow. Unfortunately I do not have a meter currently. So what's the different between four vs three terminal option? I do have an automatic transmission and was told that it would determine what I would need if I do need to replace it
The normal 67 thru 70 something.

Used a switch in the automatic to make a path to ground when the trans is in neutral or park.


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That wire runs to the 4th terminal on the relay.


On the bypassed relay the same terminal is soldered to the housing of the relay always providing a ground path regardless of what gear the trans is in.


Your wiring does not have a 4th wire for the ground side of the NSS

Depending on what was done to your wiring you might be able to start your car in gear so be carefull