Robert, It all boils down to contact. Yes, Dirty, crusty contacts after years of touching. I have repaired many window switches, but never tackled a side mirror switch. You might look into another. The cleaner may extend the life for a short while, but it won't fix it. Cleaner won't take away pitting and burnt contacts. John Hervey www.specialTauto.com << Can someone explain why this is happening in either (or both) of these instances? I probably know the answer--a combination of a bad wire somewhere or a dirty switch--but what is the easiest fix to accomplish without being an electrician? I already know how to remedy intermittent tail lights, but I know nothing about these two issues. >>