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Thread: Headlight Wiring Issue

  1. #1
    Join Date
    Feb 2012
    Location
    Kent, OH
    Posts
    49

    Headlight Wiring Issue

    Having a wiring problem with my 400ex, for some reason the headlights quit working, no high or low beam. I've looked through the wires under the hood and in the switch assembly on the handlebars and everything appears ok. Tested for voltage and with the quad running or not I was only getting a reading of 0.7 volts at the light switch? Any ideas on what might be wrong? Attached is my diagram.IMG_20160627_181316901.jpgIMG_20160627_181316901.jpgIMG_20160627_181316901.jpg

  2. #2
    Join Date
    Apr 2005
    Location
    WI
    Posts
    8,922
    could be a short somewhere if you dont have power to the switch, keep tracing it back to plugs at the battery and such. it could be a bad regulator as well. ive seen it on snowmobiles, not so much a 400 but anything is possible. especially if you dont find any ground out areas or blown fuses. check continuity across all wires in the set for the lights in the harness that connects across the front and back to each disconnection point.

    good luck with it, let us know what the result was.

    steve
    2019 Maverick X3 XDS Turbo R
    2003 TRX 400EX
    2016 HONDA RANCHER

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