new member with 74 dodge dart starter problems

Ok so I installed my new starter yesterday and got my battery hooked up. I wanted to see if the car had power since this a build from pieces parts. I hooked up the positive to the top of the starter ran another cable to the starter relay hooked up the negative to the top of the starter and ran that through the relay also. Hooked up and grounded my battery engaged the negative cable on the battery and the dam thing turned over without the key even being in the ignition. Now nothing else is hooked up to the transmission except the starter. What the heck is going on?