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Thread: Lights not working - no, it's not the bulbs :)

  1. #1

    Lightbulb Lights not working - no, it's not the bulbs :)

    On my 1991 R100GS the horn, indicators and all lights don't work with the key in the ON position while break lights do work.

    In the park position the lights work. All fuses seem ok, too.

    Any ideas?

  2. #2
    Liaison 20774's Avatar
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    When you say the fuses seem OK, what do you mean? Did you take them out and measure the tip to tip resistance? According to the diagram, the F4 fuse seems to be a common power source for those items. Does the clock work? It also seems to be on the same power circuit. Maybe try spinning the fuse and help scrape off any corrosion on the ends.
    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
    Yes, the fuses have continuity as measured with an Ohm meter And I sanded contacts and applied dielectric grease before reinstallation.

    Also worth mentioning that the lights stopped working without any modifications, just stopped one day then worked again for a few days then stopped altogether.

  4. #4
    Liaison 20774's Avatar
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    Hmmm. I'm not so good with these diagrams, but now that I reread the key in the ON position, it does appear that one of the paths through the switch sends power to the load shedding relay. From there, power goes to the F4 fuse, which as I said before, appears to power those devices that don't work. I'm not sure what the internals are like on the relay, but it has terminals 30, 85, 86, and 87. Maybe check the connections on this relay?
    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
    Thank you

    That sounds like a reasonable suggestion ... how do I locate/identify the load shedding relay on the bike?

  6. #6
    Liaison 20774's Avatar
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    On my /7, all of these relays are under the tank. Not sure about the '91. Maybe someone who's been there will drop in. These relays are cube about one inch on a side. They could be under the tank...could be inside the headlight shell. If you find these relays, you should at a minimum pull them out and replug them a few times. They are male terminals plugging into a base. The load shed relay, according to the diagram, has wires going to it that are red, black, green, and green/black.
    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!

  7. #7
    Registered User lmo1131's Avatar
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    "load shedding" relay? Whats that Kurt?

    You speak of one like this?

    Keep in mind that a relay needs a ground terminal (85) for the trigger circuit (86) ... so, as mentioned, check your ground connections/paths. If the relay doesn't make an audible "click" when energized it's dead (or not grounded).


    Is this the diagram you're referencing? http://i864.photobucket.com/albums/a...nda/wiring.jpg
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  8. #8
    Liaison 20774's Avatar
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    Quote Originally Posted by lmo1131 View Post
    Is this the diagram you're referencing? http://i864.photobucket.com/albums/a...nda/wiring.jpg
    No, that diagram is for the '78 models and has it's "issues". The diagram that I've been looking at is in my Haynes manual.
    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
    IMG_0874.jpg

    This must be it , even though it has 5 contacts, not 4

  10. #10
    Airmarshal-IL James.A's Avatar
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    Kurt, I don't recall if our /7's did this or not, I know that the /5's that Lew and I ride are not so equipped, but the load shedding relay turns off accessory circuits (headlight,etc.) when the electric start is engaged. This is to allow for maximum current availability when turning the electric start motor. My knowledge and memory are a bit sketchy on this, but it seems to me any airhead without a headlight off option on the hi-lo switch might or ought to have a load shedding relay. To follow this notion out a few turns, the load shedding function might be incorporated in to the starter relay or associated with the starter relay if it is a stand alone component. I hope Paul Glaves sees this and issues commentary. I am confident that he would know all about it.
    1973 R75/5

  11. #11
    Liaison 20774's Avatar
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    James -

    My /7 does turn off the headlight when the starter is cranked. My Haynes doesn't show a load shed relay on the diagram, so it must be done somewhere else. The Haynes diagram for the '91 clearly shows the relay as part of the circuit routing out of the ignition switch. I'm just looking at the obvious...it could be more complicated than this. Certainly, making sure all relay contacts are free of corrosion and all grounds are solid is a first step.
    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!

  12. #12
    Airmarshal-IL James.A's Avatar
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    Quote Originally Posted by 20774 View Post
    James -

    My /7 does turn off the headlight when the starter is cranked. My Haynes doesn't show a load shed relay on the diagram, so it must be done somewhere else. The Haynes diagram for the '91 clearly shows the relay as part of the circuit routing out of the ignition switch. I'm just looking at the obvious...it could be more complicated than this. Certainly, making sure all relay contacts are free of corrosion and all grounds are solid is a first step.
    I completely agree with your recommended first step. The question to my mind would be how mmorgenroth's non-working circuits line up with the circuits that are disrupted by the load shedding relay. For example, the flash to pass feature is wired hot thru the thumb switch on most airheads. On my /5, the flash to pass will light up with the key removed. The the horn is also hot thru the switch (not on a relay). The challenge here would be to parse the various functions by close scrutiny of the wiring diagram. Wiring diagrams give me headaches. I admire you and some of our other participants who try to analyze them for our friends here.
    1973 R75/5

  13. #13
    Liaison 20774's Avatar
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    Quote Originally Posted by James.A View Post
    Wiring diagrams give me headaches.
    Pass the aspirin! I just saw that the items that don't work seem to be connected to one particular fuse, but he says the fuse is good. Between that fuse and the ignition switch is really only one thing...the load shed relay. Simplistic, but seems like something to consider!
    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!

  14. #14
    Let me echo the comment on headache about wiring diagrams and the generous feedback from the community ... thanks again for all your suggestions.

    The relay needs to travel from Germany to Canada and will take a couple of weeks to arrive ... I will let you know if it was the culprit.

    Of course it would be great if anybody knows a place that has it in stock here.

  15. #15
    Liaison 20774's Avatar
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    If we're still talking about the load shed relay, I believe that BMW part number is 61311459677. Some info I've squirreled away indicates that Bosch relays 0332017100, 0332207100, 0332207300, 0332207301, and 0332207310 might be possible replacements. Also, I wonder if such a relay was used on BMW cars??
    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!

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