2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 359Get this manual
! CAUTION Buildup in the grooves must be removed to prevent any chance of an electrical arc between individual sections of the commutator
10Inspect the commutator for shorting using multimeter and the following procedureASet the selector to the OHMS positionBTouch the black lead to the armature shaftCUsing the red tester lead, probe the commutator end of the armatureThe meter indicator should not changeIf the indicator shows resistance, the armature is shorted and must be replaced11Inspect the armature for shorting using "growler" and the following procedureAPlace the armature in the "growler BWhile holding metal strip on the armature, rotate the armature an entire revolutionIf the metal strip vibrates at any point on the armature, the armature is shorted and must be replacedBC009
2On the positive post, install an O-ring washer, fiber washer, flat washer, and lock washerSecure with the nut