oLemurs

So i just got a new battery hoping it would help to turn the engine over and it didnt help anything, so i took out the starter and while i was down there i saw this plug and didnt know what it went to so i took a pic http://imgur.com/gallery/ltNFu i was looking into how to test an sr20 starter and i saw a picture with a wire coming OFF of the starter solenoid. the only wires i had attatched to my solenoid were the ground and 12v from the battery, is this plug what i need to get the engine to crank over? if so do you know where i can buy the wire for it?