Question about 2001 BMW R 850 GS

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Battery issue

I have abmw r 850. When I turn on the headlights when I ride, it drains the battery. I checked the generator and it is putting out 13.5 volts. Replaced the voltage regulator after testing it also to make sure that this wasn't the problem. Bike still isn't charging the battery when running the headlights. Battery keeps a charge if I don't turn on the lights. Goes dead after about 50 miles of riding. Well...not completely dead but not enought to start the bike again with the electric starter. I have been through my repair manual several times to try to figure this problem. Any suggestions PLEASE. I have a friend with a 74 sporty with the same problem. Dealership won't even look at it because they can't understand the problem either.

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If you have a volt-ohm meter check for voltage draw and grounds and shorts. Put the meter on the VDC scale remove either the pos or neg wire from the battery, then connect one lead to the wire and the other lead to the battery post where the wire was removed, you should have 2 volts or less, next remove both wires from the battery, set ur meter on ohms scale R1, you should have a high ohm reading between both wires, and probe the pos wire and the other probe to a frame ground, you should have infinity or high ohm readings. If you do have a short curcuit check the wiring that goes thru the handlebars, while leaving the meter hooked up, dissconnect one wire at a time untill the ground goes away. You can also do this with a test light, remove one battery post and hook up a test light in a series curcuit, if the light lights up, you have a short curcuit. Dissconnect wires untill the light goes out, then trace that wire see if its damaged. The older HD's had a problem with the wiring thats routed inside the handlebars.

Posted on Nov 20, 2008

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Battery draining on suzuki S83 boulevard - can ride it for a couple of hours then it just cuts out


Sounds like you need to check the generator and charging circuit.

The bike will start and run on the battery alone until it is drained.

Once a bike has been started the battery power is taken over by the generators power this also replenishes the power lost in the battery when the bike is initially started. If the generator does not generate power the bike will continue to us the power from the battery until it is exhausted and will therefore stop.
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Hi, Anonymous if your headlight is not working, keeps burning out, blinking, or is dim the first thing you need to check is the headlight bulb for damaged filaments then check your light circuit fuse, that being said the usual suspects are:
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2. Worn, chaffed, or broken wires in the light circuit.
3. Corroded, broken, or loose pins/sockets in wire connectors.
4. Faulty hi/lo beam switch.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Lighting Star 1100 Wiki Knowledge Base
Headlight issue on stock VStar 650
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2000/LIT-11626-13-36_96.pdf

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