2008 Arctic Cat ThunderCat ATV Service Manual, Page 100Get this manual
The ECU is rarely the cause for electrical problems; however, if the ECU is suspected, substitute another ECU to verify the suspected one is defectiveError codes can be cleared by following the procedures located in the ECU Error Codes sub-section in this section Headlights
The connectors are the four 2-prong ones secured to the front bumper supports (two on each side) with cable tiesBULB VERIFICATION (Low and High Beam)
NOTE: Perform this test on each headlight bulbAlso, 12-volt external power supply with jumpers will be needed
RegulatorRectifier