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Thread: Need help on R50/5 charging issue

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  1. #1

    Need help on R50/5 charging issue

    I just bough an R50/5. It starts and runs well. But when lights and turn signal is engaged while riding it drains the battery so quickly!!
    But when riding with NO lights and turn signal battery is fine.
    I presume there is a problem with the charging system (dont know which part and what's causing this). What would be the cause of this problem? Any help is greatly appreciated...
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  2. #2
    Registered User 80092's Avatar
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    For starters Check with a voltage meter the amount of voltage to the battery when running . Lights off then on and compare . The problem could be a relay or brushes, be sure to have a good ground and check other related wires. Can't hurt to go to Snowbum's site for more detail.
    Nice Bike BTW !
    Peter Murray
    Stroudsburg, Pa.
    IBA 359
    2014 RTW, 73 R75/5

  3. #3
    P Monk
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    all you need to know

    http://www.motoelekt.com/goodstuff.htm

    This is like the Bible for Airhead electrical problems. All the answers are in there.
    P. Monk
    74 R90/6 (the Black Hole), 2011 R1200RT.

  4. #4
    Registered User lmo1131's Avatar
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    1) When you insert the "key" and push it all the way down, does the red generator warning light come on? Location 3 below
    2) And does it go out when the engine is running?
    3) Do you know, reliably, how old the battery is?



    Ditto what Peter said. I always liked that color: Federweise, I think?
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  5. #5
    Quote Originally Posted by lmo1131 View Post
    1) When you insert the "key" and push it all the way down, does the red generator warning light come on? Location 3 below
    2) And does it go out when the engine is running?
    3) Do you know, reliably, how old the battery is?



    Ditto what Peter said. I always liked that color: Federweise, I think?
    1.) when key is inserted and pushed all the way down, the generator warning lights is "NOT ON"
    2.) NO light when engine is running
    3.) I just bought a new Yuasa battery.

    QUESTION:

    1.) What would be the possible cause of this issue? and what parts is involved? and how to test the parts if defective...i.e. diode, voltage regulator, rotor, stator..etc?
    2.) How big is this job/repair in scale of 1 - 10?


    BTW thanks for complimenting the bike. I really like the color of it...

    Regards,

  6. #6
    Liaison 20774's Avatar
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    As Lew was pointing out, that red light is pretty critical. It's actually part of the charging circuit...the book from Motorrad Elektrik shows that. If it's burned out, then current from the battery is not getting to the windings of the alternator to start the electro-magnet. Without that, you won't get any charging.

    Seems like the first thing you need to do is get into the headlight and carefully retrieve the bulb and check it...possibly all that needs to be done is replace it.

    Down the road, if you're interested, there is an electrical mod that can be done to insert a resistor in the wiring harness which will allow for charging even if the bulb is burned out. That's really for a situation on the road so you can still get home, because you really do want to see the light and get feedback from it.

    I'd say it's a 2/3 out of 10 type of job...depends on the general skill set. But be sure and ask questions about getting things apart as the /5s might have a few tricky steps. And if you're not getting charging (have you started it and measured the voltage at the battery...it should rise to near 14v at say 3500 RPM), the more you ride it, you will be pulling the battery down and eventually get stuck and/or possibly ruin the battery.

    Let us know what you find out.
    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
    Thanks for the reply...

    So if it's just the red charging bulb, can this be repalced? or do I have to buy a complete headlight assembley? I hope buld can be replaced...thanks again

  8. #8
    Awesome...great thanks Paul..

  9. #9
    Registered User lmo1131's Avatar
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    You don't need to remove the tank to remove the front cover. Take out the three bolts. Move the cover forward as far as you can and then down and out.
    I find it less of a hassle to remove the horn as well. A little more effort (one more bolt), but a bit more clearance.


    Photo Credit: Brook Reams
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

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