2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 296Get this manual
LIGHTING SYSTEM 2The tailbrake light fails to come on1Tailbrake light bulb and bulb socket (4D31) Check the tailbrake light bulb and socket for continuityRefer to "CHECKING THE BULBS AND BULB SOCKETS" Are the tailbrake light bulb and socket OK? YES NO Replace the tailbrake light bulb, socket or both2Tailbrake light (4D35, 4D39) Disconnect the tailbrake light coupler Connect the battery (12 V) to the tailbrake light coupler terminals as shown When the jumper leads are connected to the terminals, the tailbrake light should illuminatePositive battery terminalblue Negative battery terminalblack 3Voltage