Daughter's car. Light doesn't come on and plugs don't energize intermittently. Not a huge problem at these temperatures since it will start without the plugs but I need to get it figured out before summer's over. Anyone else experience this? I'm thinking a problem internal to the relay?? Hard to do diagnostics since most of the time it works fine. I did replace the mechanical end of the ignition switch recently due to a failure in the locking mechanism.

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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