Hey, my name is shane and I work for a company called Smart Start Inc. We do court ordered and voluntary breathalizer ignition interlocks. Im having some trouble with a car im working on at the moment. Its a 2011 Mercedes E 350 4matic with a V6. I need a 12v switched ignition source for the devices we install. The wiring we need is starter wire, 12v switched ignition, and 12v constant. I am using the battery for the constant and I found the starter wire i needed at the fuse block under the hood. But I cannot find anything under the hood to use as a 12v switched ignition source. Any help would be appreciated at this time. Seeing as dealerships wont help me at all.

 

did you find a way?