Yeah, the Perko ones.

By inside the fixture I mean that I touch the probes to the contacts inside the fixture. I have cleaned the contacts and sprayed WD 40. Nada. Treis severl bulbs in hopes one was bad. Nada.

Sky Guy, if you wnat your multimeter back better come over see if you can help figure out the problem.

Maybe I too will just buy the flashlight clam on ones. My boat is just a 16 foot Smokercraft and I damn seldom run after dark. Maybe I need a new Alumaweld.
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No huevos no pollo.