Charging System Pooched? -
Troubleshooting Having trouble with your bike? Common know issues or trobuleshooting questions here.

LinkBack Thread Tools
post #1 of 4 (permalink) Old 09-16-2010, 02:10 PM Thread Starter
Training Wheel Hero
Join Date: Aug 2009
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Charging System Pooched?

So I went up to start my bike one morning and it failed to start. At first the cluster lit up when I turned the key, but after I pressed the starter button, I had no lights at all after that.

The day before I rode the bike and it was fine.

I tried to connect the bike's battery to my car battery (with car off of course) to jump start it. The bike started but as soon as I removed the jumper cables, the bike died.

I emailed the bike shop I got the battery from earlier in the season and they said it was likely a charging problem but I wanted a second opinion as I do not have experience with the electrical system of the bike and dont want to pay for something I dont need. Can you guys confirm this?
SLOW_1 is offline  
Sponsored Links
post #2 of 4 (permalink) Old 09-16-2010, 02:17 PM
Posts: n/a
Start the bike and rev the engine to about 5,000RPM. Check the voltage at the battery. If it is staying at 12.xx volts or below, you have a charging system problem. If it's around 14v, your battery may be bad.
post #3 of 4 (permalink) Old 09-20-2010, 04:49 PM Thread Starter
Training Wheel Hero
Join Date: Aug 2009
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
So I tested the bike out with a new battery that I borrowed, these are the readings.

With new battery...
Before start: 12.72
Turn key: 12.15
Idle: 13.7
3k: 13.85
6k: 13.9

With my battery (not trickle charged yet)...
Before start: 12.38
Press starter button: 5

Last edited by SLOW_1; 09-20-2010 at 05:05 PM.
SLOW_1 is offline  
post #4 of 4 (permalink) Old 09-21-2010, 07:03 AM
Nico's Avatar
Join Date: Apr 2010
Location: Adelaide
Posts: 13,137
Thanks: 135
Thanked 1,530 Times in 1,047 Posts
Feedback Score: 2 reviews
Probably not even worth trying to recharge your old battery. AGM batteries don't take well to being discharged that far.

Your voltages also look fine so the issue is more than likely just a dead battery.
As a side note, you are also supposed to have the high beam on when you check the charging system voltage (at 5k rpm), anything below 13.5 or above 15.5 is bad.
Nico is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

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

For the best viewing experience please update your browser to Google Chrome