2000K1200LT Charging light glowing - BMW Luxury Touring Community
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post #1 of 17 Old May 10th, 2020, 9:02 pm Thread Starter
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Question 2000K1200LT Warning light glowing

Warning light on dash glowing

Its a long story LOL, but ill get to the point of this question , after hacking the alternator with a used regulator from a 1999 ebay alternator purchase ,because my bike wasn't charging the battery, I examined how to take a chance with just putting this used regulator in, ( im not up to the task of tearing the bike apart to properly change the whole alternator in my back yard under a tent LOL) so I put the new ( used regulator in and now my charging voltage is way to high ,up to like 18v when I rev it up good, so any thoughts anyone? Thanks, Norman

Last edited by Njlucia; May 11th, 2020 at 9:59 am. Reason: i had the wrong title
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post #2 of 17 Old May 11th, 2020, 3:18 pm
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Re: 2000K1200LT Warning light glowing

How did you even get to the regulator to change it out? Well I have a lot of stuff under my seat so maybe there is enough room to get the cover off. Sounds like you got a bad regulator off e-bay. Since the voltage is high the rest of the alternator is good. Go to Euromotoelectrics (https://www.euromotoelectrics.com/category-s/1636.htm) they have new regulators for $39.
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2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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Last edited by jzeiler; May 11th, 2020 at 3:26 pm.
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post #3 of 17 Old May 11th, 2020, 6:04 pm Thread Starter
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Re: 2000K1200LT Charging light glowing

wow, Thanks again for your response, so I rode with 3 batteries hooked up with a solar panel LOL to charge it so I could at least ride to town and back, but when the bike pooped out a few weeks ago and wouldn't run any ,then I was forced to start to tear it apart, I had decided a few months ago that IF I could replace the regulator it might be the key ,and I was right ,but putting it in was a real problem. so , with the tank off and battery out, I cut the top of the old alternator off with a long sharp woodworking chisel ,( I knew where to cut because I had the ebay replacement alternator and regulator that I could examine, so I cut along the breather vents of the plastic very carefully of course and could only go 80 % of the way, the rest, was not able to get access to it, the frame is in the way, so I lifted and bent back toward the frame the remaining cover enough to unscrew and remove the regulator ,,when putting the new used regulator in I used a tiny amount of hot melt glue to hold the screws in place and screwed it in. I couldn't tell if it would work until I fixed the hall effect sensor wires, but was sad to see the blaring warning light and 17.2 volts wile riding. LOL that's my story, and I love my 2000K1200 I bought it new off the showroom floor and have had 20 years of fun with her. Now as im old retired and living in a camper the life has changed from my younger, more prosperous days ,but I can still ride with a smile ,,the original Bosh regulator number is: Bosch 1 197 311 542 voltage regulator , but finding one is another issue

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post #4 of 17 Old May 12th, 2020, 12:27 pm
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Re: 2000K1200LT Charging light glowing

I bought mine new as well in 2004 love the bike.

Here is the BMW PN : 12 31 1 739 365 VOLTAGE REGULATOR 0.11 1 $186.56

and here is from the EME page:
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John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 17 Old May 21st, 2020, 9:03 am Thread Starter
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Re: 2000K1200LT Charging light glowing

Update, I installed a 2nd used voltage regulator yesterday, I got about 17volts for a few mins ,then no voltage ,what other possibilities are there ? the dash light goes dim while idling .
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post #6 of 17 Old May 21st, 2020, 2:03 pm
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Re: 2000K1200LT Charging light glowing

OK when you measure the voltage everything is hooked up as normal and you are measuring at the battery terminals? Hate to say it but used is used for a reason sometimes. Are you sure the terminals of the regulator are making proper contact?

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #7 of 17 Old May 21st, 2020, 5:33 pm Thread Starter
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Re: 2000K1200LT Charging light glowing

hello again , yes im measuring at the battery with a multimeter ,additionally I have a digital voltage display for a car dashboard hooked up, and interesting to note or not it was blinking at 11.8 or so volts today when I was inspecting things ,when I shut the bike off the battery went back to 12.3 or so volts, so yes I know what your saying about used ,but for 18$ and a few hours work I figured it was worth a shot , so I ordered a new one today ,but Im hesitant to put her in when I get it because I think something else is going on. thanks for your thinking cap!
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post #8 of 17 Old May 21st, 2020, 9:18 pm
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Re: 2000K1200LT Charging light glowing

I am with you on this, but I cannot think of anything external to the regulator that would cause this over voltage condition. An alternator is basically a three phase AC generator that is fed to a rectifier bank that provides a DC output. The regulator controls the voltage that goes to the exciter coil (through the brushes) to control the final output voltage, normally 14.3 v or so. This leaves the regulator as the sole source for controlling the output. If the the regulator put a FULL 12 V on the exciter coil the alternator could produce 120 volts at a higher RPM. We used to do this to field service trucks to power 115 V tools in the field.
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John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #9 of 17 Old May 22nd, 2020, 8:20 am
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Re: 2000K1200LT Charging light glowing

I would check the battery by disconnecting it, putting it on battery charger and checking the voltage during the charge cycle.
If you are charging up to 17/18V you should be frying the battery as the current required to drive a healthy 12V up to 18V would be a lot.
At least if it charges remotely from the bike you can be sure that it is a bike problem.
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post #10 of 17 Old May 22nd, 2020, 7:17 pm
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Re: 2000K1200LT Charging light glowing

One more question is the orientation correct? I don't know if it could be installed 180 out.
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John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #11 of 17 Old May 23rd, 2020, 10:43 am Thread Starter
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Re: 2000K1200LT Charging light glowing

the orientation is correct, it might be possible to turn the regulator 180deg however it wouldn't make a good contact on a spring loaded metal tap I guess is a grounding tab, and I carefully left the screws in place and orientation when I replaced it , when I get the new regulator I will try and clean all the contacts as best I can, but good thinking , also jndunne, thank you for your thinking too, I will take your suggestions as well , thanks everyone ill let you know whats happening when I get the new regulator in
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post #12 of 17 Old May 27th, 2020, 5:08 pm Thread Starter
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Re: 2000K1200LT Charging light glowing

I installed a new voltage regulator today ,and the voltage seemed proper ,BUT ,still seeing the warning light shining bright even at 5000 rpm, I got rained out so I dint do much else , I read the Clymer book some more
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post #13 of 17 Old May 27th, 2020, 8:15 pm
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Re: 2000K1200LT Charging light glowing

OK on the correct voltage (but what was it 14.5,13.8 ?)but not OK on the charge light. In the diagram the charge light has switched power applied to one end and the the Blue wire that goes onto the alternator. The voltage from that light provides initial tickle voltage to the alternator rotor (controlled by the regulator). In your case the alternator end of the bulb is seeing a ground and not 12v. The only thing in that loop is the diodes in the alternator. So I am thinking now that the alternator itself was always the problem and not the regulator. Looks like you may be swapping out the alternator. Its not really that bad and you don't need to remove the transmission but you do need to drop the rear of the engine to do it. But it will involve removal of everything behind the engine and under the tank to clear the air box.
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John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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Last edited by jzeiler; May 27th, 2020 at 8:20 pm.
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post #14 of 17 Old May 27th, 2020, 9:30 pm Thread Starter
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Re: 2000K1200LT Charging light glowing

my voltage was 14.5 and steady , i'll, need to think about what you said, thank you John
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post #15 of 17 Old May 28th, 2020, 5:17 pm
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Re: 2000K1200LT Charging light glowing

I would say you have it working and there may be something else causing that light to be on. At this point I would just run it and see how the battery does. Might try to pull the blue wire clip off and see what the voltage does and if the light goes out.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #16 of 17 Old May 29th, 2020, 1:42 pm Thread Starter
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Re: 2000K1200LT Charging light glowing

today I was doing other things with the bike (little repairs etc, and turned it on again and was getting 13.2-5 volts at 2000 rpm's and it did increase up to 14.3 around 4000 rpm , I was thinking to try something like you suggested ,my question is ,If it is charging (as it seems) what harm is it that the light is on ,other than I don't like to see that light on? or could I put a diode someplace in line somewhere ? I know it needs the voltage to excite the stator? from the dash light but then what happens ,, I'm just not knowledgeable enough. thanks
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post #17 of 17 Old May 29th, 2020, 3:45 pm
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Re: 2000K1200LT Charging light glowing

It is up to you, I see no harm in leaving the light lit other than when and if it does crap out you will not have a warning. Recommend you check the voltage once a week for a month or so and go from there. Piece of tape over the light.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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