My '05 C4500 service truck has had the cylinder replaced and for some reason I don't have accessory. After having a $35 key cut just to unlock the doors, I don't care to spend the $$$ for another cylinder and rekey just to run my radio on a repair call. Thinking I could rung a switched hot to my radio, I pulled it and found it has constant 12V in with another orange wire with ~.4V and jumps to ~1 - 3V then back down to ~.4V upon key turn. Is this an anti theft signal wire? Can it be fooled with a jumper some way?