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79F: What color is the brake light wire into the taillight?

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  • #1

    79F: What color is the brake light wire into the taillight?

    I have looked at the wiring diagram. I just don't believe it. Taillight is blue; ground is black. Then I have yellow, green and brown. The wiring diagram says the brake is green/yellow and I have no gr/y. The wiring diagram also does not mention a yellow at all.

    I am innthe final stages of mounting my Vetter trunk and I would really prefer to do it without causing all electrical problems on my fine running machine.

    TIA.

    Patrick
    The glorious rays of the rising sun exist only to create shadows in which doom may hide.

    XS11F (Incubus, daily rider)
    1969 Yamaha DT1B
    Five other bikes whose names do not begin with "Y"
    Tags: None
  • #2
    Originally posted by Incubus View Post
    I have looked at the wiring diagram. I just don't believe it. Taillight is blue; ground is black. Then I have yellow, green and brown. The wiring diagram says the brake is green/yellow and I have no gr/y. The wiring diagram also does not mention a yellow at all.

    I am innthe final stages of mounting my Vetter trunk and I would really prefer to do it without causing all electrical problems on my fine running machine.

    TIA.

    Patrick
    Mines a G so I'm not sure the colors are the same, plus my trunk doesn't have the Vetter harness so it's homemade. But if you can't figure it out with a meter, I'll see if I can figure out at least what it is on mine. Kinda cold and wet out there though what with the bike being right by the garage door and having to open the door to work on it, and driving rain and 14 MPH winds with 40MPH gusts don't work well with that .
    Cy

    1980 XS1100G (Brutus) w/81H Engine
    Duplicolor Mirage Paint Job (Purple/Green)
    Vetter Windjammer IV
    Vetter hard bags & Trunk
    OEM Luggage Rack
    Jardine Spaghetti 4-2 exhaust system
    Spade Fuse Box
    Turn Signal Auto Cancel Mod
    750 FD Mod
    TC Spin on Oil Filter Adapter (temp removed)
    XJ1100 Front Footpegs
    XJ1100 Shocks

    I was always taught to respect my elders, but it keeps getting harder to find one.

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    • #3
      Originally posted by Incubus View Post
      Taillight is blue; ground is black. Then I have yellow, green and brown. The wiring diagram says the brake is green/yellow and I have no gr/y. The wiring diagram also does not mention a yellow at all.
      Process of elimination... yes, the taillight is blue, ground black. The brown is actually 'chocolate' and should be left turn. The dark green is right turn, so the 'yellow' should be brake. Sure you're not a bit colorblind?

      If you're wondering why the turns are there, that's so you have a ready connection point if you run saddlebags...
      Fast, Cheap, Reliable... Pick any two

      '78E original owner - resto project
      '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
      '82 XJ rebuild project
      '80SG restified, red SOLD
      '79F parts...
      '81H more parts...

      Other current bikes:
      '93 XL1200 Anniversary Sportster 85RWHP
      '86 XL883/1200 Chopper
      '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
      Cage: '13 Mustang GT/CS with a few 'custom' touches
      Yep, can't leave nuthin' alone...

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      • #4
        you could use a voltmeter...

        just turn ignition on and test wires one by one to determine which has power for taillight, then while you twister your foot up onto the brake test for brakelight.

        John
        John is in an anonymous city with an Alamo (N29.519227,W-98.678980)

        Go ahead, click on the bikes - you know you want to...the electrons are ready.
        '81 XS1100H - "Enterprise"
        Bob Jones Custom Navy bike: Tkat brace, EBC floating rotors & SS lines, ROX pivot risers, Geezer rectifier, new 3H3 engine

        "Not all treasure is silver and gold"

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        • #5
          You have an accessory lighting connector under the seat. You can test wire function there and do your connections to all the lights with one plug, no cutting and splicing that way. The connector should be clipped to the fender just in front of the TCI box.
          Former owner, but I have NO PARTS LEFT!

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