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Check the fuses, I am not sure if the 1990's had a headlight relay or not (My 1987 Cabriolet does not) but if there is a head light relay its by the battery, if there is one, put your ear down by it and have someone turn the headlights on, you should hear a click.
Also, the turn signal switch/cruise control switch, pull it forward towards the steering wheel and see if the lights come on. If the headlights come on when you pull that assembly towards the steering wheel I am thinking you have a bad headlight switch.
The clicking sound is the headlight relay / thermal limit switch -- probably faulty. The light switch operates this relay -- something could be overheating or the relay coil could be faulty and not holding the realy contacts closed. Sounds like replacing the relay would be the most likely solution.
According to Autozone you will find the Headlight relay "Under hood, driver side, front engine area, driver side of headlight housing, mounted on fenderwell"
Once you find the relay, with the engine off - turn on the lights and have someone change them from high to low and back a few times - if the relay is working you should be able to hear it clicking as it changes. If you do not hear it clicking remove the relay - take it to your parts store and they should be able to find a reaplacement
I had a similar problem on my 2001 Caravan. Turned out to be a loose connection between the frame control module and the fuse box. I unscrewed the frame/front control module from the fuse box and bent the tabs slightly to make better contact. Then tighten down the module securley. Need star driver to loosen screws
There is a circuit breaker inside the headlight switch body. It gets weak over time and use. The breaker is actually mentioned in the owners manual. A new switch is about $75.00 at the local parts store. You must remove the front of the dash to change the switch. Mine would go off and then in about 30 seconds reset and the lights would come back on. I would be driving down the road with my headlights flashing as the circuit breaker opened and closed. New switch = problem fixed.
On some models there is a dimmer switch that says it controls the headlights. Move the switch up until it clicks, and then back down again. You may have to mess with a little bit, some switches are like combination locks. Of course, some models you can't turn them off short of pulling of fuse. And for the switch i describe earlier, it will only turn them off while you are out of a drive gear, once you shift into gear, the lights will turn back on. Merry Christmas!