my car came from japan ,the ex owner just unpluged his aftermarket lights and took the bulbs and holders.i did the brake lights and then couldent stop drivin it long anough to get a round to doing the rev lights.reverse lights now ,ive just got the .but no iv got the n c t text [national car test] coming up my q is red wire is + black is - but whats the red/yellow for?im usein single filiment bulbs right?oh and was the rear fog light a clip on bumper style one?cos i dont have one ....oh i have a aftermarket aero rear bumper/kit ...many thanks always learnin