SOHC.co.uk Forums > CB500/550

Charging

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hairygit:
If pressing the starter gets it back, check your earth cable to frame connection from the battery

Fairview:
OK I will.

Thanks!

madoc:

--- Quote from: Fairview on September 15, 2012, 12:14:41 PM ---Thanks for the replies everyone.

Steve, this is the sort of step by step idiot guide I was hoping for, so here are the figures

1. 12V
2. 11.25V
3. 11.60V (fluctuating)
4. 11.78V (fluctuating)
5. 12.26V (fluctuating)


--- End quote ---

Is that 12v with nothing on ?
That's not good, a decent 12v battery should be around 12.7v.
Put it on charge overnight, then disconnect for a few hours and see what it reads then.


 

SteveD CB500K0:

--- Quote from: Fairview on September 15, 2012, 12:14:41 PM ---
1. 12V
2. 11.25V
3. 11.60V (fluctuating)
4. 11.78V (fluctuating)
5. 12.26V (fluctuating)


--- End quote ---

Firstly, 12.0V is with nothing switched on is the sign of a dead battery. It should be at least 12.6V
Try disconnecting it completely and measuring it. As Madoc says, charge it overnight and then see what the terminal voltage is.
Looks like the first thing to do is buy a new battery.

Secondly, under revs the charging circuit should be regulated to 14.5V or thereabouts. 12.26 is not enough to charge your battery. In fact, its probably discharging at that stage.
So you need to look at the charging circuit as well.

We can try some more tests on the charging circuit if/when you've sorted out a decent battery.

Steve

Fairview:
Thanks Steve, battery already on charge as per Madoc advice will check it when i get home but it sounds like it's knackered anyway. I'll pick up a new one and run the tests again and re-post the results.

Thanks again.

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