My 73 challenger has an alarm system on it that I want to remove as the wiring is a mess. Was this an option or aftermarket? There's a key slot installed on the bottom of the front valance. There's a pin under the hood that compresses when the hood shuts. I removed what I thought was all of the wiring but then the car wouldn't turn over. All lights turn on so I'm guessing it's an ignition cutoff? Where do I look and what do I look for? Never done anything like this before...I'll try to get pictures asap