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Thread: 1984 R65 Turn signal switch and horn not working

  1. #1

    1984 R65 Turn signal switch and horn not working

    Hi,
    I'm new to the MOA, and new to BMW. I just bought an '84 R65, and on my first long ride, the turn signals and horn stopped working about midway into a 4 hour ride (luckily I remembered my hand signals). So, my research is pretty limited on the possible causes. Since both the horn and the switch is not working, I thought there might be a ground problem. I'd be interested in anyone's opinion on the matter. Everything else works, high beams, headlight, starter, etc.

    Thanks, I tried searching, but maybe I'm not looking in the right place.

  2. #2
    Liaison 20774's Avatar
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    Welcome to the forum! Other than the lights/horn, how's the bike?? I'd check the fuse...it seems that the horn and turn signals get power from the same fuse. The ground points will likely be different for these, so I'm not thinking ground is the issue. Not sure where the fuses are...on some of the earlier bikes, it's in the headlight shell. Could be on the '84, the fuses are relocated somewhere, maybe under the seat or battery side panels? Hopefully someone will have a better location for the fuses.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    The bike is really fun... Just one more note, it appears that the brake light is also not working. Maybe it is all the same fuse.

  4. #4
    Liaison 20774's Avatar
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    I think so...the brake light power seems to be closely connected to power for the horn. I would be looking at fuses.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  5. #5
    Rally Rat 1074's Avatar
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    Fuses

    On your R65 the fuses (two of them) are in a little black box at the rear of the frame back bone, on the bottom. There is a thumb screw on the cover that holds it on. Occasionally there will be a bit of corrosion build up on the fuse and fuse mount so if the fuse looks good, you might want to scuff of any corosion that might be present.
    Boxerbruce

  6. #6
    Thanks for the help... looks like you guys nailed it.
    IMG_2506.jpg

  7. #7
    So, I replaced the fuse, and 10 minutes into my ride, it blew again. Conditions were; stopped at a light, turn signal flashing and hand brake engaged. I had used the brakes and the turn signals before that point in time... Any ideas?

  8. #8
    Liaison 20774's Avatar
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    Well, it's clear you have some kind of short. What you need to do is come up with a setup which allows you to clip to each side of the fuse block and have these two wires/clips connect to a small light bulb, like something in a flashlight. That way, the bulb won't go out but will burn brightly when the short situation is encountered. You'll need to move wires around and/or operate the turn signals and hand brake successively until the bulb indicates you've found a short. It will have to be a process of elimination until you find the exact wire that is causing the problem.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  9. #9
    And I'm guessing that is done with the engine running? So I guess the light bulb acts as the fuse? I don't put a fuse in there, right? And it should be a filament bulb, I guess.

  10. #10
    Heartbeat of my R100GS Guenther's Avatar
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    Check with your owner's manual but I think both fuses should be 8A. The blown one looks like a smaller type fuse.

    /Guenther

  11. #11
    When I bought the bike it did not come with a manual. I found one online, but I don't know if it is for a 1984 R65. The manual I found online says that the fuses must not be greater than 8A. The fuse I bought at the auto parts store was an 8A fuse (at least that was what they told me). I agree that the other one looks much heavier. I guess that may be a bigger problem, unless there are different types of 8A fuses. Looking in various places for 8A fuses online, this is what they all seem to look like:
    8AMP.jpg

  12. #12
    Rally Rat 1074's Avatar
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    The type of metal that the fuse is made of will determine the thickness of the metal where it is supposed to burn out. I have a supply of fuses enough to last through the next millenium, but the last time I bought fuses they were color codes with white corresponding to 8 amp.
    Boxerbruce

  13. #13
    Right, and the one I put in was white, and looked like the one in the image. However, I can't help but think that there may be characteristics (like slow-blow) that may be relevant, and that might be the difference between the different metals. I still can't believe that that circuit could possibly draw 8 amps without a short. There is the flasher, the turn signals, the horn, and the brake light and brake light relay. I'm going to pursue the light bulb testing...

  14. #14
    Rally Rat 1074's Avatar
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    Right! 8 amps is plenty for the designed load. So consider an intermittent short. Concentrate on what is causing the fuse to burn out and not the aspect of slow burn fuses. Basic electrical troubleshooting procedure will narrow down the area.
    Boxerbruce

  15. #15
    So, I have jerry-rigged the light bulb and inserted it in place of the fuse. I've tried to operate the electrics both with the engine on and the engine off. With the engine off, I have a battery charger that I put on the battery. I've observed some interesting things:
    - the brake light comes on when I depress the rear brake. It does not come on when I press the front brake. Should the brake light turn on when using the front brake?
    - the horn does not work at all, although to be fair, I never tested the horn when I bought the bike.
    - the turn signal doesn't work at all. When I had the engine off, I could hear a buzzing from the turn signal flasher when I turned the switch on. If there was a short in the turn signal switch or wiring, would the buzzing be expected? Or is the buzzing an indicator of a bad flasher? I believe the flasher is under the gas tank,. Is it easy to take the tank off?

    Thanks in advance for any tips to resolve this.

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