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Can somebody tell me how to test the voltage regulator,last ride the battery light came on for about 2 hours then went off,ran fine the whole time ,today the hand warmer quite working ,but the headlights and dash worked ok, the sled has 1700 miles and around 100 hours ,tested the yellow wire in the heater switch with a test light very dim light,will check tomorrow with volt meter,what should the volts be at the switch?any help would be great