actually all the wires that supply voltage to the radio in this car carry the same voltage ~12 volts when the car is not running, and ~14.4 when the car is running. these wires DO NOT carry different voltages because they both get the same power from the battery of the car. you can test this by using a DMM. also, this car is not equiped with a remote lead in the car harness, only what was stated before 12 v constant, 12 v switched, and what bnuk added, a illumination wire that only has voltage when the lights are on. btw, i work for a car stereo shop and have done tons of radios and alarms.