Join Date: Jun 2006
Bikes: '00 Bruce Gordon Rock and Road Tour, '01 Breezer Venturi, '97 Specialized Stumpjumper M2 Pro, '87 GT Timberland, '82 Benotto single speed, '48 Schwinn Phantom, '71 Schwinn Pea Picker, '07 BFSSFGIRO
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First, since you don't really know the history of it, change the battery. That usually will get it back to normal. I have several of these, and when I know the battery's fresh, I double check to make sure that neither the magnet nor sensor have slipped, and then I slip it out of the harness, wipe the connections and slide it back in. This will usually take care of any minor issues.
"Get a bicycle. You will not regret it if you live." ~Mark Twain