Can someone tell me what each post is??

[MrMagoo]

I just swapped a starter out, and it looked just like yours. There was only one connection to the starter, which was Ron's "B" from the solenoid. On the "A" side it was just connected to the battery. There was a wire hooked up to "S" but I haven't traced it back.

[trularin]

Unless you havce some real loud music playing in the background, you should be able to hear the solinoid clack on and off.

You will know if you have the right wires connected when you turn the key and the solinoid jumps in your hand.

YOU MUST GROUND THE METAL BODY OF THE SOLINOID FOR IT TO WORK.