MACH I Member
Joined: Jul 2008
Location: Long way from home
Sure sounds like it is NOT the radio to me. Removing it will remove the electrical connection to the entire car's electrical system. If it is indeed the GEM system which is basically the body control module, you have an uphill battle figuring this one out. You're gonna need wiring diagrams and ALOT of patience to find it.
1988 Mustang LX coupe will miss you greatly
2004 Mazda 6s 5 door Sport w/5spd/3.0/RX8wheels/Kon/Eibach/and then some