2011 Arctic Cat 400 TRV ATV Service Manual, Page 90Get this manual
NOTE: Prior to replacing the CDI unit to assure the CDI unit is defective, it is advisable to perform CDI peak voltage test (see Ignition Coil in this section) andor perform continuity test of the wiring harness from the CDI connector to the CDI unit RegulatorRectifier
The regulatorrectifier is located under the rear rack and rear fendersAR607D
NOTE: If the meter showed correct voltage but the starter did not operate or operated slowly, the starter motor is defectiveNOTE: If the meter showed no voltage, inspect the main fuse, ground connections, starter motor lead, battery voltage (at the battery), starter relay, or the neutral start relay
TESTING
1Start engine and warm up to normal operating temperatures; then connect multimeter to the battery as follows2Select the DC Voltage position; then connect the red tester lead to the positive battery post and the black tester lead to the negative battery post3Start the engine and slowly increase RPMThe voltage should increase with the engine RPM to maximum of 15.5 DC voltsNOTE: If voltage rises above 15.5 DC volts, the regulator is faulty or battery connection is loose or corrodedClean and tighten battery connections or replace the regulatorrectifierIf voltage does not rise, check Voltage in this sectionIf charging coil voltage is normal, replace the regulatorrectifier