Search for the purple wire/violet wire. Ok here it is: http://www.peachparts.com/shopforum/showthread.php?t=88637&highlight=purple+wire

So far I never needed it, just glow twice on a cold day (well, its never been below freezing here!

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!