Hi yes you can remove the unwanted wires but be sure you don't take out the wrong ones! the best way is to connect all the harness's that come with the ps3 kit and then. then power up with all harness's connected and turn ditch light etc and one at a time turn all lights on and then you'll get the right ones you need. The smoke unit etc the smoke unit heating element wires should a red connector and the blue connectors are for the headlight!
The purple wire is the PV voltage to power up the smoke heating element red connector. and brown wire polarity does not matter! but the smoke motor wires do matter because if you hook it up backward the smoke motor will run backwards and not puff!
Alan