I want to thank everyone for your replys. Silver Surfer answered my question
and solved my problem. After reading his post, I printed it out, and went
out to my car. I started the car, backed it out of the garage, made sure it
was in PARK and turned on the parking lights and headlights. Then, to
determine if the parking lamp relay was energized and the 10-amp DIMR fuse
was OK, I checked the license lamps in the back and found then LIT. Then I
raised the hood and the underhood lamp came ON. To test the mercury switch,
I bent down and raised and lowered the hood. At about the midway point, I
could see the light go on and off. Problem solved...thanks a million.
I want to thank Silver Surfer for his detailed answer. If the license lamps
had NOT been lit, I would have known to remove the back seat and check the
DIMR fuse. And if the DIMR fuse was OK but lacked the 12 volts, I would have
turned my attention to the parking lamp relay. Without your detailed
explanation that would have been impossible. Once again, many thanks.