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I have been working on my MK4 for several years now and finally have the body in for paint. In my build I have installed the Russ Thompson Turn signal system and have wired with what I think is the most typical using the Bosch and VW relay. When originally installed, everything worked great. The momentary switched cycled thru and everything worked as it should. About a year after installed, the momentary switch started to fail as it was not cycling thru as it should. ...