75 r90/6, lost turn signals, horn and brake light

Discussion in 'Airheads' started by ChristianJS, Jul 10, 2012.

  1. ChristianJS

    ChristianJS Adventurer

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    I got the bike running great, but i seem to have lost front and rear turn signals, brake light and horn. I seem to have found that there are fuses in the headlight bucket, but with the fairing, it seems tough to access. all wiring under tank and so forth looks fine. The connector where the wires join near batter has juice too. Any ideas?
    #1
  2. JustinP

    JustinP Long timer

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    Check your ground connections if the fuses are good.
    #2
  3. ChristianJS

    ChristianJS Adventurer

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    Any tips to removing S fairing. Removing the front turn signals seems to be the tough part
    #3
  4. chasbmw

    chasbmw Long timer

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    If it is a BMW S fairing, just remove the top mounting arms and rotate the fairing around the front indicator stalks.

    This should work if you are careful.

    You have just realized my people with S fairings often relocate the fuses out of the headlamp shell.

    To totally remove the fairing you have to remove the front indicators and very carefully stretch each side of the fairing over the indicator stalks, having removed the indicator lights first!
    #4
  5. ChristianJS

    ChristianJS Adventurer

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    makes sense, that is kind of what i was thinking but I was not sure if there was enough clearance on the bottom
    #5
  6. Horsehockey

    Horsehockey A GPS? Huh?

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    I have an S fairing on my 1975 /6. You don't have to remove or adjust the fairing at all. Instructions: Stand in front of the bike. Place two thumbs on top of headlamp lens. Push. Don't worry. Tilt headlamp upward until you can access bottom of headlamp chrome ring. Using big flathead screwdriver and thin rag to prevent scratching, pop off headlamp ring, lens and reflector (one piece) separating the bottom of the ring from the bucket. Now tilt lamp back down a little to ease the lens and reflector out the front of the S fairing. Gently set lens on front fender. You now have full access to the bucket. Get good at this and it takes less than five minutes.

    To reinstall, locate chrome ring in the notch in the top of the bucket, then POP the ring back onto the bucket. If you have the rubber seal that seals the airgap between the lens and the fairing, you'll have to remount that from inside the fairing.
    #6
  7. ChristianJS

    ChristianJS Adventurer

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    great. thank you. I tracked it to a bad fuse, replaced it, put it all back together, and everything stopped working again. This will speed up the process when I go back in today. Where in VT are you?
    #7
  8. Horsehockey

    Horsehockey A GPS? Huh?

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    Everything STOPPED working? In this case, the bike is a total loss and you should arrange disposal at my home located in Rutland. I offer this service at no charge. Sorry it didn't work out.
    #8
  9. ChristianJS

    ChristianJS Adventurer

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    yup, total loss. all this after I rebuilt carbs, flushed tank, replaced lines, brake job, etc. I will dump it in your driveway on my way to the Stowe car show in august
    #9
  10. Horsehockey

    Horsehockey A GPS? Huh?

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    Are you saying you replaced a blown fuse and it blew again or is everything good now? If it blew again, be advised that airhead horns are notorious for blowing the 8 amp fuses. The horn draws too much current....especially if there's lots of resistance from corroded connections. My horn hasn't been blowing the fuse since I cleaned up the connections, but then again, I pretty much don't use the little "beep beep" horn for anything other than an occasional response to a little kid waving at me from their yard.
    #10
  11. ChristianJS

    ChristianJS Adventurer

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    it blew after about 5 test honks on the horn. I'm thinking that I will replace the fuse, clean horn connections and then only use it for emergencies. You saved me some serious time with headlight removal tips. thank you
    #11
  12. Horsehockey

    Horsehockey A GPS? Huh?

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    Glad to help. You've learned at least three things:
    1. When your lights and/or voltmeter go suddenly wonky, suspect #1 is fuse;
    2. The ability to access the fuses without disassembling the fairing is a very handy skill....especially if you're on a road trip and parked on the shoulder in 98 degree heat; and
    3. OEM airhead horns put a real load on the circuits (and the fuse). If it were mine, I'd use a little rat tail file on the fuse clips in the bucket, I'd shine up the fuse ends, I'd apply dielectric grease to both, then install fuses. Then I'd use an abrasive on the horn connectors to get 'em really clean and apply dielectric grease there too. As mentioned above, this seems to have allowed me to use the horn from time to time without the auto-fuse-blow feature.
    #12
  13. ChristianJS

    ChristianJS Adventurer

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    strange, now when I went to put the fuse in and turn the bike on, it popped immediately. any ideas? must be a short somewhere. THe strange thing is that at least the blinkers and things would work for a while before the fuse popped
    #13
  14. Horsehockey

    Horsehockey A GPS? Huh?

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    Time to go to the electrical experts. I couldn't find my way from the left side of a wiring diagram to the right side without hitting a dead end.

    If it were mine? I'd disconnect the horn entirely, put a new fuse in, and turn the ignition switch on again. If you have all signals and no blown fuse, pretty good chance you've isolated the problem to the horn.
    #14
  15. ChristianJS

    ChristianJS Adventurer

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    after looking thru some diagrams, turns out I had a couple of wires crossed on the ignition switch. I cleaned everything up and soldered in a 10amp blade fuse.
    #15
  16. Horsehockey

    Horsehockey A GPS? Huh?

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    Good job. Where did you solder in a new 10 amp fuse, and why? Just curious.
    #16
  17. ChristianJS

    ChristianJS Adventurer

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    In the top fuse slot. I didnt like the way the german fuse was sitting in there, and it was a bit hard to access so I had a spare part from a gps unit, and soldered the wires to each end of fuse clips. Now it is tucked right down in front if I have a problem again (with horn or something).

    [​IMG]
    #17
  18. Horsehockey

    Horsehockey A GPS? Huh?

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    That could be handy. When you say it's now "right down in front" do you mean that it's close to your relays in the front of the bucket or that the fuse is now located outside the bucket? And a second question: why a 10 amp fuse and not an 8 as in OEM? I think I can guess the logic (10 won't blow as easily) but I have to assume you're putting the wiring at greater risk. No?

    I know what you're saying about how awkward it is to remove and install those fuses, and, for that matter, to deal with the tight connectors on the board. I've found that the following tool makes all the difference:

    http://ak.buy.com/PI/0/1000/221829443.jpg
    #18
  19. ChristianJS

    ChristianJS Adventurer

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    only put a 10 in to test, as i didn't have any 8's on hand. I'll grab some before I wrap everything back up. I left it inside the bucket, but in front of the rats nest of wiring
    #19
  20. Horsehockey

    Horsehockey A GPS? Huh?

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    Good man. Now someday, when you've got way too much time on your hands, it's a good idea to remove and clean up and dielectric grease all the connectors in the bucket (one at a time unless you want to experience a nightmare). Same with the ground connections on the main spine under the tank and, while you're under there, remove, clean and grease all connectors on the starter relay. Maybe you've done all this already. If not, it can save you lots of grief down the road.
    #20