I thought I was done messing with my windows after I replaced two motor/regulator assemblies and lubricated all of the tracks. But then the master window switch started giving me trouble by only working intermittently.
I took it apart and thoroughly cleaned the copper contact points with Q-Tips. Before you spend money on a new or used switch assembly ($40-80), try this out first.
Here's the guide -
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Cheers, Paul Michaels '01 Grand Prix GTP Ft. Lauderdale, FL