You have lost power to your left front fog light on your 1991 Jaguar XJ6 All fuses are good and no other lights are out?

Answer 1

Never easy on a Jag. Fault could be in following areas. 1. Module to light fitting wiring. There's a red/orange wire from the Left Front relay and Bulb Failure module (just behind the headlight to side of radiator) to the light fitting. With module output plug disconnected and foglight bulb fitted, ohm-meter between red/orange wire and car body, should be low resistance. If not, bad earth to foglamp or bad foglight fitting. 2. Relay and Fault Module. There's a red/orange wire into the Left Front relay and Bulb Failure module, you should see a change in elecrical state when the switch is operated similar to right hand module (same place other side of radiator). Alternatively and with electrics off, ohm-meter between red/orange input wires to left and right modules and look for low resistance. If not, broken wire between modules, strap another wire across. With input connected and electrics on, the output pin to red/orange wire to the light should be 12v (on) or 0(off). If not, suspect the module. Left/right modules are interchangable and can be swopped to see if the fault changes over.