Used a battery charger to check the old plugs I took out. Positive lead on the post, neg on the threads of the barrel. Reading ~12.5 volts between the post and barrel. NO GLOW ON ANY OF THEM!

Am I doing something wrong? I recall doing this last time I changed them, even with the new ones before I put them in. The new ones got red hot fast!

All fail at the same time? All were put in at the same time. Weird.

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2002 E320 Sedan 93K Designo Mocha Black Metallic!
1995 E320 Wagon 205K Black Wagon
1982 240D 183K SloPoke

I believe each of these cars are the final production year for that model.