my reversing / fog light dose not work i have changed the fuse and bulb ,followed the wires underneath can not see any breaks or shorts on it. the haynes manual with its circuit diagram espescially for the layout for the fuses is different to the ford focus owners guide wondering could it be an earth problem and where in the boot is the earthpoint since the manual dose not say ? what i find is strange both rear fog lights going into whaty looks like a conector block and is fed from wires from the boot yet only the offside rear works and the nearside / revers dose not and if they all use the same earthing point as the rear lights how come they still work ? confused !