rear fogs, you say??? Those must be the spare holes on the inside of the rear lenses. I'm planning to parallel my brake lights and put another set of sockets and bulbs in those holes.
Thanks for the info. I'll stop testing those bulbs now.

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1983 M-B 300D, 148K, daughter's ride
1983 M-B 300TD, 120K, my ride
1985 M-B 300SD, 102K, wife's ride
1969 HD FLH, 45K, restored/hobby
1996 Chev Suburban, family taxi/tow vehicle
1990 John Deere Model 240
1942 John Deere Model LA
1985 16' 4Winns ski boat