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Thread: 1978 R100/7 - Turn signal

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  1. #1
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    1978 R100/7 - Turn signal

    I have a 1978 R100/7. When a turnsignal bulb is burned out, is the dash indicator light designed NOT to blink?

    Just wondering.

  2. #2
    Registered User PeoriaMac's Avatar
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    It's been a while since I burned one out...but I remember it blinking faster with only one turn signal light on. Maybe it's just me...
    Mac
    1986 R80RT, 2005 R1200GS
    Livin' Large On The Lake

  3. #3
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    Turn signal w/trailer

    That's funny.

    I want to pull a trailer so I wired it by disconnecting the tail/stop/blinkers on the bike and going to the trailer. Everything works fine, but when I put on the left or right blinker, the "dash" light does 1 blink and then nothing more. Does this for both sides L/R. However the front flashers on the bike and the rear flashers on the trailer work on just fine.

    I thought that the bulb in the trailer may not be high enough amperage so the bike "thinks" that the bulb is burned out.

    What I also want to do (I had planned this anyway) is to put a little LED bulb on each side of my fairing up around the windshield so that I am reminded that way anyway. I have a habit of forgetting to turn off the turn signals so these would be the reminder to me.

    ????

  4. #4
    Administrator 20774's Avatar
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    IIRC the idea that the dash light blinks once and stops is a feature of the signal relay and bike's wiring. In more simple systems, if a bulb is burned out, the blink rate increases because there's less load on the whole circuilt due to the burned out light and the blinker element heats up quicker as a result.

    You might read Snowbum's article on adding running lights...it might provide some background on the issues with adding lights such as what you want to do:

    http://bmwmotorcycletech.info/addingrunninglamps.htm
    Kurt -- Forum Administrator ---> 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
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    Quote Originally Posted by 20774 View Post
    IIRC the idea that the dash light blinks once and stops is a feature of the signal relay and bike's wiring. In more simple systems, if a bulb is burned out, the blink rate increases because there's less load on the whole circuilt due to the burned out light and the blinker element heats up quicker as a result.

    You might read Snowbum's article on adding running lights...it might provide some background on the issues with adding lights such as what you want to do:

    http://bmwmotorcycletech.info/addingrunninglamps.htm
    To be honest, I thought it was the other way around. When the circuit through the flasher unit is overloaded (like adding a trailer and more flashing lights) the flasher actually blinks faster as the heat load is greater. When a bulb burned out, the heat load was lower therefore the flasher didn't work or was too slow. When I worked at a dealer that sold boats, and I wired a trailer to a car we almost always had to add a "heavy duty" flasher as the extra lights load caused the original flasher to blink too fast. Less lights caused it to blink too slow or not at all.

    In my R100 situation, I wired everything so that when the trailer is connected, the regular motorcycle rear lights are by-passed so they do not work. When the trailer is connected, the "dash" flasher lights up 1 time and never again, but the both front and trailer flasher lights do keep on working. However, when I disconnect the trailer and go back to the standard motorcycle lights the "dash" flasher does work.

    I noticed in Max's that the turn signal bulb is a 21 Watt bulb, and I am almost sure that the trailer bulbs are not nearly that wattage.

    I am first going to look for a 21 watt bulb to fit my trailer socket and see if that solves the problem.

  6. #6
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    As far as the "reminder" is concerned, doesn't the /7 have a turn signal buzzer? My R100S does......

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