@moayling and there is the problem right there when the right one illuminates, on the CBF that is the main beam headlamp. To have it constantly flashing or going on and off if you prefer, is illegal, its dangerous and it would never have been wired like that. Think about it, the idea of having the lights illuminate with the sirens is for the Police vehicle to be seen, if that illumination involves the main beam headlamp constantly flashing or going on and off it will dazzle and possibly temporarily blind drivers of other vehicles, it would never have been wired like that.
@spinspin its sounding more like you're going to have to completely rewire the headlamps and side lights if you want it back to stock. I knew there was more to it, nightmare.