1978 goldwing electrical help

Discussion in 'Old's Cool' started by welder, Feb 12, 2011.

  1. welder

    welder Long timer

    Joined:
    Feb 10, 2008
    Oddometer:
    1,524
    Location:
    paradise
    after replacing the timing belts in my buddies old wing we fired the bike up and noticed the headlight was now not working. we pulled the headlight out to test the bulb directly from the battery and it works fine on both hing and low curcuits. We hooked a meter up to the headlight plug and noticed that it has power on low beam only. As soon as we insert the headlight into the plug it does not work on low or high. Any ideas? I'm completly lost when it comes to electrical work.
    #1
  2. kz1

    kz1 Been here awhile

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    Ohio North Coast
    #2
  3. LasseNC

    LasseNC XSessive!

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    Power from battery to switch? (Lights on/off switch)

    Power to High/Low Beam switch?

    Power at the bulb socket?

    Do you have an earth connection that might have fallen off?

    You should have three wires if it is a standard H4 socket, high, low and earth. Are they all connected? And is one of them earthed, either to the harness or frame.
    #3
  4. eepeqez

    eepeqez Long timer

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    It is possible the Goldwing has the polarity reversed. Many Japanese cars of the same timeframe have positive supply via the on-off switch to the common pin, then earth either the high beam or low beam pin as required.

    I would check the voltage relative to battery negative (0V, +12V, floating, or something weird like +5V) at each of the three terminals on the bulb socket with no globe fitted, with the headlight:
    switched on, low beam
    switched off, low beam
    switched on, high beam
    switched off, high beam

    From this you can work out what switching scheme is used and what part of the wiring is faulty.

    But before you get completely carried away, have you checked fuses and wiggled any relevant connectors?
    #4
  5. diggersrule

    diggersrule Adventurer

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    Mar 12, 2009
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    ofallon, Missouri
    go to the naked goldwing site,i had the same problem. its the lighting unit, they gave a ton of info
    #5
  6. sporthog93

    sporthog93 Sporthog93

    Joined:
    Apr 24, 2006
    Oddometer:
    826
    Location:
    Iowa
    It is probably just a coincidence but review the repair that you made. What wiring did you mess with?
    #6
  7. Rob Farmer

    Rob Farmer Long timer

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    Aug 27, 2002
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    5,945
    Location:
    Loughborough, Leicestershire. England
    I love the early Goldwings but the wiring is a nightmare. Lots of hidden joints in the loom and unnecessary wirimg. I've spent hours sorting GL1000 wiring out.
    #7