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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?
 

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the 05 2500 and 3500 dont have accessory to the radio, its a data wire, the 4500 is probably the same way. when they replaced the cylinder did they put the switch back on right? its possible its a tooth out of place and is not getting accessory power. but no, you cant run a switch to the radio unless you were to put in an aftermarket radio.
 

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When you guys put in an aftermarket stereo where would you hook the 12v switched wire to ? Does a wire need to be run to a switched accessory somewhere ?
 

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Buy the correct harness for your aftermarket radio and install per instructions.
 

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When you guys put in an aftermarket stereo where would you hook the 12v switched wire to ? Does a wire need to be run to a switched accessory somewhere ?

Buy the correct harness for your aftermarket radio and install per instructions.
^^^ best answer


or orange at the steering column with a 5-10 amp fuse.
 
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