Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > BMW Tech
BMW Tech BMW Tech Forum - For Questions specific and of interest to BMW riders only.
Photo by Josephine Flohr, Elephant at Camp, Namibia

I haven't been everywhere...
but it's on my list!


Photo by Josephine Flohr,
Elephant at Camp, Namibia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 7 Nov 2017
Registered Users
Veteran HUBBer
 
Join Date: Apr 2009
Location: No fixed abode
Posts: 113
R80 battery not charging

Hi folks,

A strange thing - the battery red light on the instrument panel goes out with increased revs, suggesting the charging system is working fine, yet a multimeter reading stays at 12.75 V when it should be going up to around 13.5 V.

Could this be because the gel battery is on its way out? It's 4 years old and recently plummeted to 12 V. I had left the bike unused for 3mths, battery disconnected, having not used it much the preceding 2 mths.

I got it charged up to 12.75 V, but as mentioned above, it doesn't appear to be recharging via the alternator.

I have read that once gel batteries have been allowed to go dead, they're hard to resurrect.

Thoughts?

If so, can I stick any old 12 V moto battery in it, assuming it fits (I'm currently in Mexico), or does it have to be BMW?

Cheers,

Bob
Reply With Quote
  #2  
Old 7 Nov 2017
Registered Users
Veteran HUBBer
 
Join Date: Feb 2002
Location: Wessex, UK
Posts: 2,136
You can use any 12V battery that fits the battery tray although I have had a gel battery last years with gaps of 6 months between use, they are much more resiliant than lead/acid ones.
The charge light going out suggests all is well and I suggest borrowing a good battery to carry as a backup and taking the bike for a ride with the lights on to see what happens, if it keeps going all is well.
A quick check is to look at the alternator brushes and see if they are not worn out, they are shot when about half worn down so might look ok and will give some charge but it will quick drop off, also clean the slip rings on the rotor.
Reply With Quote
  #3  
Old 8 Nov 2017
Registered Users
Veteran HUBBer
 
Join Date: Aug 2012
Location: Australia
Posts: 1,131
One test ... remove the voltage regulator and short the Df and D+ wires in hte voltage regulator socket - there are 3 connections .. the brown wire (ground) you leave open, just short (connect together) the other 2.
This should set the alternator to maximum charge ... start the engine an rev it while watching the battery voltage .. if the voltage rises then the voltage regulator is suspect. Otherwise ... something else is wrong. Do not continue to run the bike this way - the battery will be over charged and eventually die, but for a short term test it is fine.

Oh .. when you remove the front engine cover ... you are disconnecting the battery before you do it .. otherwise you can short out the diode board and blow it up.

Last edited by Warin; 8 Nov 2017 at 04:08.
Reply With Quote
  #4  
Old 8 Nov 2017
Registered Users
Veteran HUBBer
 
Join Date: Apr 2009
Location: No fixed abode
Posts: 113
Thanks, Mark and Warin. You're stars. I'll give all that a go.

Anon!
Reply With Quote
  #5  
Old 8 Nov 2017
Registered Users
Veteran HUBBer
 
Join Date: Apr 2009
Location: No fixed abode
Posts: 113
Not quite sure what did the trick, but the battery is now charging with revs (around 13.75 V).

I checked the bushes, which though still working need renewing soon (close to half worn). Checked the rotar for a closed circuit - only 0.05 resistance which I take to be fine. Cleaned the slip rings with petrol.

Then connected the blue and blue/black wire in the regulator 3-pin plug. Started the engine. With revs the multimeter read > 14 V.

Thinking it must be the regulator at fault, I plugged it back in, started the engine, revved and, lo and behold, the meter reader 13.75.

Must the gremlins up to their mischief again.

Will take for a spin with lights on tomorrow morning to escape the town before the traffic.

Thanks again and all the best!

Bob
Reply With Quote
  #6  
Old 8 Nov 2017
Registered Users
Veteran HUBBer
 
Join Date: Aug 2012
Location: Australia
Posts: 1,131
Check the connectors ... you have disturbed them and remade the connections ... one of them is probably 'dirty' or loose. Bit of a clean and re crimp things so they are good and tight just might remove the fault.
Good Luck.
Reply With Quote
  #7  
Old 10 Nov 2017
Registered Users
Veteran HUBBer
 
Join Date: Apr 2009
Location: No fixed abode
Posts: 113
Makes sense. Cheers, Warin.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
AT 750 dead battery after 5 week sit. Jumped it. Now? theoverman83 Honda Tech 13 18 Nov 2013 17:07
Tenere 1VJ problems with battery charging svakak Yamaha Tech 5 22 Jun 2013 20:04
Looking to buy a 12V 10-12AmpHour battery between Mancora & Lima (Peru) arooni SOUTH AMERICA 0 7 Oct 2012 03:23
Charging cameras etc without a battery? henryuk Travellers' questions that don't fit anywhere else 26 1 Mar 2012 18:51
Slightly dull question about charging a battery / a battery charger.. Lagan Tech 6 4 Feb 2012 08:51

 
 

Announcements

Thinking about traveling? Not sure about the whole thing? Watch the HU Achievable Dream Video Trailers and then get ALL the information you need to get inspired and learn how to travel anywhere in the world!

Have YOU ever wondered who has ridden around the world? We did too - and now here's the list of Circumnavigators!
Check it out now
, and add your information if we didn't find you.

Next HU Eventscalendar

HU Event and other updates on the HUBB Forum "Traveller's Advisories" thread.
ALL Dates subject to change.

2024:

2025:

  • Queensland is back! Date TBC - May?

Add yourself to the Updates List for each event!

Questions about an event? Ask here

HUBBUK: info

See all event details

 
World's most listened to Adventure Motorbike Show!
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)



Ripcord Rescue Travel Insurance.

Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.

Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.

Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!


 

What others say about HU...

"This site is the BIBLE for international bike travelers." Greg, Australia

"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK

"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia

"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA

"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada

"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa

"This is the answer to all my questions." Haydn, Australia

"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany

Lots more comments here!



Five books by Graham Field!

Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook

"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.



Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!

New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.




All times are GMT +1. The time now is 10:00.