Wiring all depends on whether you are using a separate solenoid. If you are, you should connect both posts on the starter together. Use a short piece of 14 gauge wire. (Powermaster makes a small connector for this purpose, but you don't need it.) Then connect your positive battery source (big wire from the left side of your solenoid or the positive side of your test battery) to the large post on the starter. If you do not have a separate solenoid, your battery goes to the big post on the starter and the start signal (positive 12v source coming from your key when it is in the start position) goes to the small post on the starter. Be careful with the nut on this small post. It is metric and is easy to strip the threads - ask me how I know.
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with and without the grounding tab on the solenoid connected to ground.
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The only ground on the ford starters is thru the mounting surface. There is not a ground post. Clamp your negative battery cable to the mounting flange. Since this ground goes thru the motor plate, to the block, thru the block ground, then to the battery, you need to make sure that path provides a good ground. I added a 10 gauge wire from the mounting bolt to the block just to make sure. If you add this ground, just make sure this is between the bolt head and the back of the starter mounting block. NOT between the mounting flange and the block plate.
Hook everything up except the final positive battery positive (the positive jumper cable from the cobra to the big post on the battery). You can connect a volt meter to the battery cable and the ground to monitor the voltage. Have a friend hold the volt meter sensors or you can use alligator clips
(clicky) to hold them on the jumper cables. Then connect the final positive battery cable. It should throw out the bendix and spin.