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Thread: 1978 R100RS Cafe wiring question

  1. #1
    Registered User Blueman's Avatar
    Join Date
    Sep 2007

    1978 R100RS Cafe wiring question

    When I unhooked the wiring harness removing the rear cowl this little wire pulled loose from the turn signal and brake light wires, black and yellow wires.
    Just confirming that when I reattach I will connect the wire to the negative battery terminal. Thanks in advance for your help.

    Loose wire.jpg
    Richard Stone
    2004 R1150RT Biarritz Blue
    1978 R100RS Cafe Racer
    Often wrong.....never in doubt.

  2. #2
    MOA #24991 Pauls1150's Avatar
    Join Date
    Apr 2008
    south of Los Angeles
    Better find out what's on the other end of those wires first - those are Not stock BMW colors, and you don't want to let the smoke out...

    My schematic (which is not "RS"-specific but is supposed to cover '78) shows:
    brown = ground
    blue w/ a black runner = right turn sig
    blue w/ a red runner = left turn sig
    gray w/ a black runner = tail light
    green w/ a brown runner = brake light

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