Hi , I have an EB FAIRMONT 1993 model which the central locking is not working correctly, the dash & indicators light up but no movement in the doors, it's only happened after I changed the factory fitted trailer plug, I'm stumped with ideas & hope someone can point me in the right direction, cheers

disconnect the plug & see IF it now works ... if it does, there is a wiring related problem ie short. you 'only' disturbed the plug yeah??