If it looks like this Tuff Stuff 7629-1 Hot Start Starter Solenoid, Universal Ford{match_type}&utm_source=bing&utm_medium=cpc&utm_campaign=SMI%20-%20Shopping%20(CSE)%20(Bing)&utm_term=4577404346894511&utm_content=All%20Products%20(Feb28_2020)
the wire from the "I" terminal will go to the ignition coil. If connected to large lug it maybe powering the ignition.
After starting you should only have power on 1 large terminal