I am replacing the PITA horns on my '02 Silverado. Well ok just the drivers side high tone is the PITA. The aftermarkets aren't OEM and they don't indicate on the horn or the install guide that one is (+) or (-) and both spades are the same size. On the factory it has a special plug which in no way can I re use on the new. If there is a difference in the factory wiring which is which? It was late ,dark and I was tired. I'm pretty sure it wasn't read and black as I have YET to find any wires of that color unless I installed it. If need be I'll start looking through the schematics but, I still have to finish re looming the driver's side and put the truck back together to go to work tomorrow night. At least it'll be a sweltering 39 degrees when I wake up to finish my project tomorrow morn. Reminding me why I moved to sunny Florida. So thanks in advance.