I have a 93 YJ Sahara 4.0.

There is a JVC stereo/cd player in my dash. One of the wires say's 12vdc on it and goes directly to the battery. But the unit only works with the ignition turned on. Is there a change I can make so the stereo works without the ignition being on? I want to listen to my XM radio while outside the Jeep.

Thanks.