1985-1986 Honda ATC250R Shop Manual, Page 228Get this manual
ELECTRICAL SYSTEM
AC REGULATOR
Remove the headlight case (Page 15-6)Disconnect the lighting switch couplerStart the engine and measure the voltage between the whiteyellow and green wire terminals at the main harness side of the couplerVOLTAGE:
If the voltage is not within specifications, check the AC regulator as described on next page
LIGHTING SWITCH COUPLER
WIRE CONNECTORS Remove the seatrear fenderDisconnect the AC regulator wire connectors, and remove the regulator attaching bolt and the regulator