When I put the key in the slot, start the car the radio wont come on sometimes so I put the wipers in the on position, wiggle the key around and back and forth when the wipers start working so does the radio. What do I need to replace to fix this.

 

Think about it. Wiggling the key in the IGNITION SWITCH eventually gets the radio and wipers working, neither of which worked before and both of which draw their juice through the IGNITION SWITCH. Have you figured it out yet?