Question about BMW K 100 RT Motorcycles

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Flickering lights, bike not starting

Ok. So, I have been using a battery regulator the past few weeks and hadn't had any issues with it. Although my battery is only a month old, I was told that I should use this to maintain it...Anyway, I unplugged this the other day and left for work. On the way there, my tach/speedo lights and headlights/turn signals began to flicker. On my way home, the lights did the same thing and eventually went out completely. I turned off the bike for a few minutes and when I went to start it, all I got was a buzz...I let it sit for 20 minutes or so and it fired up. Today it started up, and I rode a mile, turned it off for a few minutes, went to start it and buzzz...Let it sit for about an hour, and tried I was relatively close to my house, I had a buddy push me a bit and I was going to push/coast home. After moving fifty yards, I turned the key and 'boom', it started... I removed the battery, cleaned the contacts, had it tested...All are fine.... What do I do???

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  • BMW Master
  • 8,404 Answers

Check your grounds, check your alternator, check the diodes in the charging system

Posted on Dec 02, 2012


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Posted on Jan 02, 2017

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SOURCE: wont start

hi anna,, i had one of these babies,, the battery is history sweety,,
if the battery is a new one tho ,, then solonoid needs to be looked at,,

Posted on Dec 27, 2008

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SOURCE: 1997 honda shadow ace vt1100c2 ..starter switch, electrical

bad connection on starter or batt check bof of em

Posted on Aug 04, 2009

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SOURCE: My bike has a new battery. I ran it a few weeks

hello all and w8bnl i am going threw the same problem right now...i lost all power horn now lights ..nothing... shwitch had 12.6 volt to it but when turnd on went to 0 volts. the battery had 12.6 volts but when shorted pos. and neg. terminals no spark and volts whet to 0 volts..replaced battery with new fully charged ran for 3 min fine then ran rough and shut off. acting like a dead battery put jump box on it and it started back up then ran rough again,shut down and just turns looking for information also

Posted on Jul 08, 2010

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SOURCE: My 2002 TW200 won't start,

Hi, seems to be eletrical issue. Make sure if the battery works properly- check voltage. Weak battery can have correct voltage level when it is retiring, but when you e.g. push the starter, it quickly looses power.

If the battery is OK, it could also be a short circuit somewhere. You mentioned the carburetor cleaning- check if the heater unit cables on the carburetor are plugged correctly. Also, check fuse.

Posted on Aug 30, 2010

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Why won't my lights work

It sounds like your alternator is not charging the battery. Fit a new battery remember to undo negative lead first to remove and fit positive lead first to refit the battery. When the new battery is filled please charge it using less than 1 Amp DO NOT use a car charger or try to jump start it. Your new battery should show 12.5 to 13 volts on a meter for a 12 volt system and 6.3 to near 7 volts for a 6 volt system. Start the scooter and check across the battery terminals your meter should show about 14.4 V for 12 volt battery and about 7.5 V for a 6 Volt one. No voltage increase means your charging circuit is not working. Either the alternator or rectifier(regulator) are not operating correctly. Worst case scenario is both units dead.

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I have a 2003 Deuce and my OEM battery went bad, when I would start it the check engine light would come on and then go off after about 30 seconds. Then it left me stranded, while driveing the bike went...

Sound very much like a low charge rate(your bike is not recharging the battery).
You need to have the bikes charge rate checked.
Basically-your bike should charge at a rate of 13.4- 14.2volts(DC) when running.
If it's not- the battery will keep going flat.
The test is performed by starting the bike & placing a voltmeter across the battery to measure the output.
It's a relativily quick & easy test to perform that only takes a few seconds-but if the charge rate is low then its caused usually by the regulator or the alternator(stator).
If you have a multimeter-or know someone who does-then the test is pritty easy & you need to do that before you go any further.
If you do it yourself- set the meter to Volts DC at a range higher than 15volts(if the meter is not auto-ranging) run the bike with the volt meter probes touching the Battery(black probe to battery negative-red test probe to battery posative) & observe the voltage reading.
You want 13.5 to 14.2v.
If you can't do it yourself then an auto-electrician or bike shop should be able to do it while you wait for just a few dollars.(only the test though- if the charge rate is low then you have then other issues to solve)

I hope this was of some help
Kind regards Andrew Porrelli

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Ride Safe

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