The headlights "retract" by gravity but lift via a lift motor. Failed headlight lift motors are probably one of the biggest problems on early 1990 versions of the Capri. If one headlight lifts fine but the other one won't, you'll need to replace the lift motor. Mercury did put a manual lift knob behind each headlight that can be turned by hand to lift the headlight into place in the event of a motor failure. You can use the lockout switch on the center console near the emergency brake to lock the headlights in the UP position once you get both of them up properly. This avoids having to open the hood and crank the knob every time you turn the lights on. Rebuilt lift motors are available online at many autoparts places that specialize in Capri - just Google "Capri headlight lift motor"
The most probable cause is that the voltage regulator has failed. The regulator is an integral part of the alternator so you will probably have to replace it.
it's your headlight switch
Are you sure it's the proper headlight for the car? Occasionally, installing a halogen bulb as a replacement (when the original was non-halogen) will cause the fuse to blow.
What would cause a headlight not to work on a Corsa SXI
bad bearings, lack of oil
A dimmed headlight is usually cause by a bad ground. Check the connections in the headlight wiring. Sometimes they can get water in there and just a little bit of corrosion will cause bad connection.
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Yes it can cause bulbs to blow.
Mercury is highly toxic and working with it can cause mercury poisoning.
there is no fuse i beleave just for the right headlight, i presume your right headlight is not working, do you have xenon or halogen bulbs, if you have xenon then the most likely cause is headlight xenon control modules, if the module is the cause i would sudjest replacing both headlight modules, and the front right xenon bulb. good luck.
Run a ground wire to that headlight. If it gets brighter, there is a problem with the ground in the wiring harness.
blow fuse, bad motor, bad switch or wiring