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  1. #1

    R100 support for heated gear

    I have a stock 79 R100RS and would like to fit it out for heated jacket / pant / gloves. I understand that the stock bike is not capable of supporting the load that heated clothing will impose. Can anyone confirm / dispel this and is there a solution?

    Thanks,

  2. #2
    Liaison 20774's Avatar
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    That idea is generally correct. You would need to add up the watt-draw from the heated gear and compare that to available power. Most likely you would need to consider an aftermarket 400 watt alternator. Check out Mottorad Elektrik.
    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
    Thanks Kurt
    Is it just as simple as swapping the alternator or are there other mods required?

  4. #4
    Check that. I see that all required information is provided on the Mottorrad Elektrik site.

  5. #5
    Registered User Bob_M's Avatar
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    The kit will include a new diode board also. I have installed the Motoradd Electric 400 watt alternator on two airheads and my mechanical skills are in the middle "shade tree" range. getting at the diode board mounting nuts/posts takes some patience and dexterity, but I found the swap to be quite doable. You will be pleased with the outcome.

  6. #6
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    I don't run any extra electrical loads but when i see this question i wonder if it would be cheaper and easier to convert the head light and maybe other lamps for LED equivalents? About 45 watt or more saving on the headlight alone, maybe there is a reason folks don't go this route, but I've wondered about it in the past. Maybe all the gear you listed would still exceed the output perhaps. Must be cold around your parts. 90F here today, and nice riding today. cheers.

    edit to add: some more snowbum info on airhead stock charging systems and what they will support. About half way down.

    https://bmwmotorcycletech.info/altcapability.htm
    Last edited by chunk; 09-27-2019 at 12:28 AM.

  7. #7
    Liaison 20774's Avatar
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    Snowbum has a discussion about LEDs near the top of this page:

    https://bmwmotorcycletech.info/lamps.htm

    I don't know what a stock H4 bulb draws offhand...Snowbum's link to a product shows an LED set up that is rated at 25 watts for each of the low and high beam.

    One thing I wonder about...maybe he discusses it...what is the light dispersion from and LED. The lens/reflector in the stock headlight is designed for the standard bulbs.
    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!

  8. #8
    Registered User STEVENRANKIN's Avatar
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    My Experience

    I can tell you my experience with my 84 R80RT (basically the same charging system as your bike stock).

    I was fine with just the heated hand grips.

    When I moved on to a heated jacket and clothing, the system was not able to keep up.

    I have since installed a system from http://www.motoelekt.com.

    My feeling is it was worth the money to upgrade the system.

    As for service and installation, Rick at Motoradd electrik is the person to do business with.

    The new system is very much a bolt in, No major modifications needed. St.

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