RE: Headlight fault
Chris,
The bulb failure relay operates by passing the current from say, the left and right headlamps through two separate coils either side of a reed switch, which, if the current is equal in both coils is held in it`s normally open position, an imbalace of current in the coils causes the reed switch to be pulled one way or the other lighting the warning light. These systems are very over sensitive and can even be triggered by bulbs from different manufactures taking slightly different currents.
A lot of people avoid this problem by removing the bulb from the dash light!
A somewhat ignominious end for a bulb failure warning system!
Colin.
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