bmw r90 starter relay wiring

Discussion in 'Old's Cool' started by allanbem, Feb 20, 2011.

  1. allanbem

    allanbem n00b

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    Does anyone know the the proper wiring to the starter relay on BMW r90/6 . Mine was disconected when I got it.
    Thanks
    #1
  2. blaine.hale

    blaine.hale Long timer

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  3. wirewrkr

    wirewrkr the thread-killer

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    Here, this should clarify things.
    This from an original /6 factory manual from BMW
    Sorry, but my scanner is busted so I drawed it.

    Attached Files:

    #3
  4. El Hombre

    El Hombre Banned

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    Put some grease on the female terminals, all the crap coming off the front wheel seems to end up under the tank and corrode those leads.

    I've had my tank off a couple of times in the last couple of years when it wouldn't start, cleaning the terminals fixed it. It impressed the guys I was with that I could whip the tank off that fast and fix it. Of course they had newish Jap bikes, so they don't get that vintage ownership vibe..
    #4
  5. mfp4073

    mfp4073 Long timer

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    Its late, Ive seen 500 miles of racing, been up for 20 hours on 3 hours of sleep, drove 6 hours total.....but thats some kinda funny to me right now!
    #5
  6. Wirespokes

    Wirespokes Beemerholics Anonymous

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    If the relay doesn't work once it's all wired up proper, there's no need to spring for the super expensive stock unit. The only difference between it and a normal (inexpensive) one is a couple of spades for connecting two totally disrelated leads - they have nothing to do with the relay with no connection internally.
    #6
  7. melville

    melville Long timer

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    You have my attention. Which are the redundant ones? What sorta relay would do?
    #7
  8. wirewrkr

    wirewrkr the thread-killer

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    he's talking about the blue leads.
    #8
  9. Wirespokes

    Wirespokes Beemerholics Anonymous

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    I believe all the data is in the Airheads parts sticky thread at the top of the page. Without looking at the data, it's just a normally open relay, and the two blue wires (as wirewrkr said) just get connected together on their own.
    #9
  10. Overdog

    Overdog 'Burghherfer.....

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    I'd just call Rick at Motorad elektric....he'll fix you up. I had found an article on line on how to replace the relay with a GM A/C relay...my parts store didn't have the exact part but I fould a similar relay. Wired it up and it worked fine.....for a month or two. Three times the bike started cranking on it's own....with the key turned off! Luckily I was near the bike each time it happened. I got a different relay from Rick and paid less than i did at the local parts store.....it's been fine since.
    #10
  11. picinisco

    picinisco Scottish Transplant

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    Why are the terminal numbers here different from the wiring diagram?

    D+, 15, 30, 31b, 87

    as opposed to

    85, 61, 30/15, 86, 87
    #11