There is one easy way to tell: peel back the elbow boot where the wires run and see if you find broken wires. 9.5/10 times that’s the problem and the location.?
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As far as adding extra length of wires when repairing, I guess that’s ur call. It’s tough doing wire repair work in that area without gaining a lil extra length, via unplugging the harness on either end or adding a lil extra wire,but then your doubling the amount of onerous connections you need to make securely. Last time I dealt w this repair the new complete harness for each door was still avail from the dealer so I went that route.?
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Justin
2000 mvwk 1.9TDI Syncro 5-spd
503k mi :-)
Justin Soares