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#1020451 - 10/08/18 10:41 AM Charging Question  
Joined: Aug 2015
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Rogerl Offline
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Rogerl  Offline
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Northfield, Ohio
I have a small volt meter on my 2013 R1200R. Typically when I am riding the bike the volt meter reads 14.0 to 14.1 volts. Over the last few weeks the meter has been reading 13.6 volts. I do not have the heated grip on or using the heated jacket. No extra lights were added. Nothing has been added to the bike. The battery is about 3 years old and it is on it's last legs. I am gong to replace the battery next spring. Is it just the battery that is causing the low charging voltage or is there a possible problem with the alternator. And information would be appreciated.


Thanks
Roger L

#1020456 - 10/08/18 11:45 AM Re: Charging Question [Re: Rogerl]  
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dirtrider Offline
The Oracle
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Ohio
Originally Posted by Rogerl
I have a small volt meter on my 2013 R1200R. Typically when I am riding the bike the volt meter reads 14.0 to 14.1 volts. Over the last few weeks the meter has been reading 13.6 volts. I do not have the heated grip on or using the heated jacket. No extra lights were added. Nothing has been added to the bike. The battery is about 3 years old and it is on it's last legs. I am gong to replace the battery next spring. Is it just the battery that is causing the low charging voltage or is there a possible problem with the alternator. And information would be appreciated.


Thanks
Roger L


Morning Roger

Once started & running then the battery condition should not be effecting alternator charging voltage.

The BMW alternator/regulator is usually pretty stable so in your case I would first suspect that you have a problem with your on-bike voltmeter or have a problem with the voltmeter's connections.

Maybe put a good quality voltmeter on the battery posts to verify the true charging voltage.

Where is your add-on voltmeter picking up it's voltage input from?


D.R. ___
Sent from my rotory dial wall phone!
#1020477 - 10/08/18 04:09 PM Re: Charging Question [Re: dirtrider]  
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Rogerl Offline
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Rogerl  Offline
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Joined: Aug 2015
Posts: 137
Northfield, Ohio
Dirt Rider:
I need to look to see where the volt meter is connected. It has been a while since I installed it. I have a volt meter on my TPMS unit and it is reading close to the same voltage 12.5 volts. I will hook up another vole meter right to the battery and see what that reads.

Thanks
Roger L

#1020479 - 10/08/18 04:12 PM Re: Charging Question [Re: Rogerl]  
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dirtrider Offline
The Oracle
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Ohio
Originally Posted by Rogerl
Dirt Rider:
I need to look to see where the volt meter is connected. It has been a while since I installed it. I have a volt meter on my TPMS unit and it is reading close to the same voltage 12.5 volts. I will hook up another vole meter right to the battery and see what that reads.

Thanks
Roger L


Afternoon Roger

12.5 volts is a pretty dead battery.


D.R. ___
Sent from my rotory dial wall phone!
#1020506 - 10/09/18 12:35 AM Re: Charging Question [Re: Rogerl]  
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Rogerl Offline
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Rogerl  Offline
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Northfield, Ohio
More Data.
The volt meter is hooked to the auxiliary fuse block under the seat. Tonight driving home from work the volt meter read 13.9 to 14.0 volts. When I got home and shut off the bike the voltage read 13.2 volts. I went inside changed cloths and came out and took off the seat. I connected my digital volt meter to the battery with the bike ignition switch off and the voltage was 13 volts. I turned on the ignition switch and the volt meter on the bike came on and it read 12.6 volts my volt meter hooked directly to the battery read 12.6 volts as well. I started the bike and both volt meters read 14.0 volts. I let the bike sit 3 hours and when I turned on the ignition to check the battery voltage it was 12.5 volts.
It looks like the volt meter on the bike is reading identical to my digital volt meter that I hooked to the battery. The temperature going to work this morning was 68 degrees F. Coming home the temperature was 86 degrees F. I will see what the volt meter on the bike reads driving into work tomorrow.

Roger L

#1020744 - 10/12/18 10:56 AM Re: Charging Question [Re: dirtrider]  
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Capt.Ret. Offline
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Raleigh, NC
Originally Posted by dirtrider
Originally Posted by Rogerl
Dirt Rider:
I need to look to see where the volt meter is connected. It has been a while since I installed it. I have a volt meter on my TPMS unit and it is reading close to the same voltage 12.5 volts. I will hook up another vole meter right to the battery and see what that reads.

Thanks
Roger L


Afternoon Roger

12.5 volts is a pretty dead battery.

Dirt Rider:
When you say 12.5 volts indicates a pretty dead battery, what should my voltage read if my MC is not running and not connected to a trickle charger. The voltage meter was installed by the previous owner and I don't have the knowledge to figure out where it is connected.

#1020745 - 10/12/18 11:14 AM Re: Charging Question [Re: Capt.Ret.]  
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dirtrider Offline
The Oracle
dirtrider  Offline
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Ohio
Originally Posted by Capt.Ret[quote=Rogerl

Dirt Rider:
When you say 12.5 volts indicates a pretty dead battery, what should my voltage read if my MC is not running and not connected to a trickle charger. The voltage meter was installed by the previous owner and I don't have the knowledge to figure out where it is connected.


Morning Roger

It depends on: what type of battery (Gel or AGM), battery temperature, time since last charge or since last engine running.

At a nominal battery temp (not real hot or real cold) then most good condition fully charged AGM 12v batteries will show in the 12.7v-12.85v range.

At a nominal battery temp (not real hot or real cold) then most good condition fully charged Gel 12v batteries will show in the 12.8-12.85+v range.

The above voltages are for a direct battery post voltmeter connection. If the voltmeter connection is made to wiring in the vehicle harness, or post ignition switch, then it could be a tenth or more lower.

Static battery voltage is just a quick status, to really know battery condition it should have a proper load test.


D.R. ___
Sent from my rotory dial wall phone!
#1020807 - 10/13/18 11:42 AM Re: Charging Question [Re: dirtrider]  
Joined: Jun 2018
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Capt.Ret. Offline
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Posts: 3
Raleigh, NC
Dirtrider:

Well, I guess my battery is okay. I asked because when the engine is cold (been sitting overnight, trickle charger attached) it's slow to crank. I'm worried about going somewhere, park for several hours, and then not have enough juice to turn the engine over.

Thanks, and, by the way, I find your responses to others' inquiries to be very helpful. I rarely post, but often read.

Originally Posted by dirtrider
Originally Posted by Capt.Ret[quote=Rogerl

Dirt Rider:
When you say 12.5 volts indicates a pretty dead battery, what should my voltage read if my MC is not running and not connected to a trickle charger. The voltage meter was installed by the previous owner and I don't have the knowledge to figure out where it is connected.


Morning Roger

It depends on: what type of battery (Gel or AGM), battery temperature, time since last charge or since last engine running.

At a nominal battery temp (not real hot or real cold) then most good condition fully charged AGM 12v batteries will show in the 12.7v-12.85v range.

At a nominal battery temp (not real hot or real cold) then most good condition fully charged Gel 12v batteries will show in the 12.8-12.85+v range.

The above voltages are for a direct battery post voltmeter connection. If the voltmeter connection is made to wiring in the vehicle harness, or post ignition switch, then it could be a tenth or more lower.

Static battery voltage is just a quick status, to really know battery condition it should have a proper load test.




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