The 03/04 models and the 05-up Reverse models all use a magnetic pickup located in the LH Lower driveshaft bearing retainer. There really isn't a lot to go wrong w/this system, as it's just a little magnet located in the end of the shaft. Only way to check the magnet is to remove the bearing retainer/voltage regulator/speedo pickup module from the end of the driveshaft. Chances are, if you are having these problems, it's in the speedo module itself. The 05 diamond drive models did have a big problem with the speedo sensors, and Cat has corrected the problem for 06 and with replacement parts for the 05's.
1971 Massey-Ferguson Formula Three 400 JLO Fan Twin
:You gotta start somewhere
98 ZRT 600
:Trail ridden ONE day.......Lesson learned-"Don't drink and ride"
99 ZR 500 EFI
:2300 Trouble Free miles.
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