I replaced the coil wire in the SEL the other day, and tonight, on a test run, I opened the hood (it was dark out) and my ignition coil wire was ablaze with blue electrical glowing down it's entire length....My local parts place lists a spark plug wire set for $299

What causes this in a new coil wire? or any coil wire for that matter. I also see some arcing between the coil bracket and the body of the car.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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