'95 E420 Throttle Actuator

About a year ago, I replaced the engine wiring harness in my '95 E420 Mercedes Benz. Typical problem with the wire insulation becoming brittle, cracking off, and wires shorting. Was told that I should also check the wires going to the throttle actuator. Does anyone have an image of where it is on the engine, or a good technical description of where it is located? What is the syptom if the wires short on that unit? Thanks, all.