A short to ground in the positive side of the headlight circuit. Most likely by a failed headlight switch. Ford is notorious for faulty healdight switches.
To replace the headlight assembly on the 90 Caprice, you may need to remove the grille. You will need a quality Torx(r) screwdriver. Once the headlight assembly is out of the vehicle, the bulbs can be removed. The bulbs turn about 75 degrees counter clockwise. If the vehicle has Halogen bulbs, be careful not to touch the glass tubes with your bare fingers as the oils from your fingers can cause the bulbs to fail.
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.
Remove the two scres that hold in the headlight. One is found on top and is called the jackscrew. The second is on the outside near the turnsignal. Once they are take out, slide the headlight out and put a cloth down to protect the lens, you can access the bulds that need to be changed. Don't touch the bulbs with your fingers because the oils from your fingers will cause the bulbs to explode. Once they are in, put the headlight back into the opening and put the screws back in.
There are a couple of reasons this could be happening. Firstly it could be that you are using cheap poor quality bulbs but assuming that you aren't it sounds like the voltage to the bulbs is to high indicating that there is a problem with the alternator's output voltage regulator. Put a test meter across the battery terminals when the engine is running (make sure you test leads and hands are clear of moving parts) and you should see a voltage of between 13 -14 volts if higher get your alternator checked out.ANS2:Are you using halogen bulbs? If so, you must be particularly careful to not touch the glass with your fingers. The oil on your skin will carbonize and the stain will cause the glass to get hot and blow out at that point. If you are frequently on rough roads, or if your car has a bad vibration, both can cause the bulb's life to be shortened.
If you pop the hood, on the back of the headlight housing, there are some wires with a snap on or twist on connection. If you disconnect them as you pull them out the headlight is attached to the other end of the connection. Make sure not to touch your new bulbs with your hands because the glass on a headlight bulb is designed to run at a high temperature, but the oils on your hand get hotter than the temperature they are suppose to operate and will cause them to blow or bust. If you do accidentally touch one, just wash it off with alcohol.
On the 1998 Buick Park Avenue, the headlight bulb can be replaced by raising the hood and removing the back panel of the headlight assembly. It is held on by two clips at the top. Then, remove the old bulb and replace with the new one, being careful not to touch the bulb itself. Touching the bulb will cause the bulb to overheat and burn out again right away because of the oil in the fingertips.
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