Im getting ready to just test run my 1936 its a body off restoration I have 2 coils one that is still connected to the intion and i have an extra that has the back off of ,their is 1 screw in the center , how do i connect this to bie pass the ignition switch just to get it to run ? the screw in the center has an insulator tab under it do i just ground it out to the side of the coil that is grounded to the frame , this is a positive ground car ?