1987-2003 Yamaha YFZ350 Banshee supplementary service manual, Page 240Get this manual
1 ELEC 3 1
LIGHTING SYSTEM
TAILLIGHT DOES NOT COME ON
1Taillight bulb conduct check Remove the taillight bulb Connect the Pocket Tester (YU-03112) to the bulb terminals as shown, and check the bulb for continuityCONTINUITY DOES NOT EXIST ON CIRCUIT Bulb is faultyReplace it
CONTINUITY EXISTS ON BOTH CIRCUIT 2Taillight bulb socket conduct check Install the bulb to the taillight socketConnect the Pocket Tester (YU-03112)to the taillight leads (Black Blueand check it for continuityCONTINUITY DOES NOT ON CIRCUIT Bulb socket is faultyReplace it