very easy, I did it myself in about an hour. Too bad, I did it in fall and couldn't quite test the new wiring. Be sure the buy the 40A fuse from the dealer. It was very hard to find from the low rant auto stores. I searched a radius of 25 miles from where I live and I cannot believe none of the popular auto chain stores stock the 40A fuse (the medium sized one).

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98 ML320 (gone but not forgotten)