2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 473Get this manual
SIGNAL SYSTEM
1.If the oil temperature warning light does not come on: Check that the light comes on when the start switch is pushed onG Check that the light comes on when the oil temperature is 145 (293 F) or higher
1.Bulb and bulb socket Check the bulb and bulb socket for continuityCONTINUITY 2.Voltage
NO CONTINUITY
Replace the bulb andor bulb socket
Connect the pocket tester (DC 20 V) to the bulb socket coupler (wire harness side)Tester (+) lead RedBlack terminal Tester () lead WhiteBlue terminal 2