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Thread: 1977 R100 lights

  1. #1
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    1977 R100 lights

    I'm starting work on a '77 R100RS I just bought knowing it needs some work. I'm looking for a starting point for working on the lights. Headlight, tail light, and blinkers don't work. Gauge lights work, horn works. I'll be getting a Clymer manual but for now I'm curious. The flash function on the headlight lights up the headlight for just that moment. I'm gong to dig into the bucket and make sure of connections but is there a common issue or place to start? Thanks

  2. #2
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    There are circuit diagrams in the resources provided in the link in my signature line. That said, in looking at my Haynes, the tail light (not brake light) gets power through fuse #58 in the headlight shell. Certainly make sure the fuse is OK. Power to the fuse comes from various places per the diagram (ignition switch and lights/horn switch) but also the light relay. I think the fact that you can get the headlight to flash with the dip switch suggests that the light relay could be an issue. I don't know of any way to check that other than to replay it with a known good one.
    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
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    Thank you

  4. #4
    I have a 77 R100RS and I've fiddled with my lights some. The wiring diagram that I like best came from Prospero's Garage; it is in color and laminated (easy to clean!). There are some other sources on-line -

    http://colorwiringdiagrams.com/ Prospero's Garage main page - below is what you want
    http://colorwiringdiagrams.com/products/bmw-r100rs-1977

    http://advrider.com/index.php?thread...please.636361/ discussion is for a slightly later model R100RS, but may still be helpful

    Following is a link to a scan for the Owner's Manual from BMW; this has a wiring diagram -
    http://www.pbase.com/dwerbil/bmw_mot..._owners_manual

    I am using LED lights most everywhere forward and aft on my RS. An exception are the turn signals - still incandescent. The LED headlight I am using came from Superbrightleds, but alas, that unit is no longer available. Similar LED headlights, albeit a bit brighter, are available from Amazon - links follow

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 These appear identical to those that I am using in my RS, but the claimed output in lumens is higher than those I am using. Mine work quite well. If you do go with some brighter headlights, it may be necessary to aim the headlight more downward to avoid blinding oncoming drivers - no joke!!

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 These are definitely brighter than those that I am using in my RS, but have the same fitment. The fitment is mostly driven by the heatsink. The braided copper headsink can be positioned easily to allow a fit in tight places. For all of these LED headlights, it is necessary to first remove the old bulb, this requires unfastening some wire clips that hold the bulb in place. I found this to be very fiddly the first time or two - now it is easier. It is a LOT easier to have someone familiar with these wire clips help. The LED bulbs have a removable piece (with the three tangs) that is secured with the wire clips. Then the LED bulb is pushed into position and given about a 1/8 turn twist. (Easy if you have done it a few times, not so easy the first time!!)

    I am also using some LED running lights on my RS. These are secured to the front fork using the bolts holding fender in position. The following link are the units that I use -
    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    Some care need be taken to aim these lights to not blind oncoming drivers. I have the running lights powered through a relay from the battery. The relay is switched by a waterproof switch, using a LED indicator; the power to the switch is taken from the headlight low beam. Some states require that running lights be turned off when high beams are on.

    The total power draw from the LED headlight (20 W) and the two LED running lights (10 W each) is 40 watts. This is less than the 55 watts drawn from the stock incandescent bulb.

    For the taillight I am using the Beacon taillight from Rick Jones at Motorrad Elektrik. This unit replaces the bulb and reflector in the stock taillight and is much more visible for both the taillight and brake light.
    http://www.motoelekt.com/lighting.htm

    I have just obtained and will soon be installing a Lite Blazer. This fits beneath the license plate and provides LEDs for supplemental taillight and brake light function. I have this on other bikes and these greatly help in having rearward drivers take notice of you. I use the units that flash the LEDs a few times upon application of the brake and then are continuously illuminated. Many states have made it unlawful to have flashing lights other than turn signals and emergency flashers. I have technical studies that show flashing LEDs reduce the reaction time of rearward drivers. When I lived in Ohio I asked about the flashing LED brake lights. Although technically not legal, the state motorcycle safety technical advisor (a highway patrol officer) indicated that the flashing LED brake lights would be ok if only flashing for a few seconds. I don't live in Ohio any longer and I don't think that his opinion overrode the legislature in regards to the law. But I doubt that a law enforcement officer would stop one solely for flashing brake lights. The link for the lite blazer follows -
    http://www.run-n-lites.com/prod-LiteBlazer.html
    Last edited by robsryder; 04-30-2017 at 09:08 AM.

  5. #5
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    Lots of good info, thanks. Upon further investigation I do have front blinkers but no rear ones, or brake or tail light.

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