2007 Arctic Cat Four-Stroke Factory Service Manual, Page 196Get this manual
SPARK ADVANCE CHARACTERISTIC
As noted above, the unit circuit detects voltage and makes switching to produce high voltage required to produce sparkOn the other hand, the wave form of the voltage generated in the primary winding changes as the flywheel turnsThe working voltage (VS) of the unit circuit is at level when the engine is started, but as the engine speed increases, the wave form of the voltage changes and advances to level B
Testing Main Wiring Harness
! NOTE: The main wiring harness test can be made using the Fluke Model 73 Multimeter (pn 0644-191)
1Disconnect the engine wires from the main wiring harness2At the main wiring harness engine connector, connect the red tester lead to the violet wire; then connect the black tester lead to the engine ground (brown wire)3With the ignition switch in the RUN position, the emergency stop switch in the ON position, and the tether cord connected, the meter must read no resistanceIf the meter reads resistance, disconnect the ignition switch from the main wiring harnessIf the meter now reads no resistance, replace the ignition switch