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I use a battery charger to test the plugs to see if they glow. I never knew about using a voltage meter, so I figured the best way to test them was to pop them out the hook up a charger to them to see if they glow.
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles
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