After recently having my rear bumper painted on the 1983 euro s , the guys connected the number plate light socket to the fog light socket , switched on the lights and back fed the front fogs with voltage. Anyway since reconnecting the wires correctly i have a tail lamp warning light on even though all lights work . I have checked the earth on the rear quarter , renewed the bulbs in the taillights. Im just wondering if this back feed could have somehow damaged my bulb control unit . Incidentally where would i find the bcu on my 83 euro s?? I may have to bypass it if i cant correct it at the wiring. Help appreciated as always.

 

Tail lamps (marker lights) include the side /rear markers - if one of those is out that will be a cause. Also check the bulbs installed they must be of the right wattage - if during assembly the wrong wattage (new?/wrongly located?) bulbs were installed that will cause this.

Markers and reversing/brake bulbs are different...

Alan

 

The bulb control unit should be bolted to the passenger parcel tray. Drop the parcel tray and follow the harness to the bulb control unit.

 

 

Bods,
It is recommended that bulbs be replaced in pairs (both sides of the car). The reason is: the warning system uses a comparative from one side to the other to determine if a warning should be shown.
For example, if a 5W bulb is replaced with a 4W bulb on one side of the car, the warning will show a fault. New bulbs of the same kind can draw different wattage from old bulbs (enough to cause a warning light)