Driving home from work on the expressway today I lost all electrical power. No electrical instruments, no windows, no turn signals but also no warning lights. Continued for about 8 miles. Then it all returned. Anyone have an inkling as to the source of the problem? Ignition switch? Battery terminals? I'm leaning towards the ignition switch. I'm thinking that if I lost a connection at the battery I would have gotten a battery no charge light on the dash? With the ignition switch off, none of those things would normally work, which I why I'm leaning in that direction.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13