I replaced the stock radio in my 2005 Cavalier the other day and I had to rig a wire to the fuse cause the radio was constantly receiving power even when the car was off. Anyways what size fuse adapter thing do I need so the wire doesn't fall out of the fuse slot it's jammed in with the fuse...

 

In the factory plug to the radio there are 2 voltage lines going to radio. One is on all the time to keep the preset station memory when the radio is turned off. The other is on and off with the key. Use these wires for your connections after figuring out with a meter which wire is which.