talbot express highwayman camper 1988
headlights dont work untill horn fuse is removed
then and only then headlights come on when horn is pushed any ideas whats wrong as this is driving me mad

abby dunbar, July 2009

John, I bow to your superior knowledge - I know nothing of motor vehicle electrics but... but... but... If the light cluster had a common eath and the earth connection were defective then surely the lights wouldn't come on at all. And does this mean that both NS & OS front light clusters share a common earth or do both sides have their own dodgy earth connection?

To get the lights on the Horn Fuse must be removed and the horn pressed - this is symptomatic of several wires in the vehicle either crossed connected or shorting.

Please argue your diagnosis in more detail - I am anxious to learn.

Peccavi, July 2009

This sounds like a faulty earth from the front lights to the vehicle bodywork....its actually a wire connection from all of the lamp holders to the body that you are looking for. Often its a good idea to put a new wire in rather than to try to cure the fault from the old one.

John, July 2009