SOHC.co.uk Forums > CB500/550

Charging

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Bryanj:
With batteries a Yuasa will cost about £10-15 morw than a Generic cheapy but will last longer as long as you dont forget to charge it after filling and before fitting

madoc:

--- Quote from: Fairview on September 18, 2012, 12:52:46 PM ---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.

--- End quote ---

Let it stand after charging and stabilise. A few hours or overnight.
If it's around 12.7, then you're good.

Having a decent battery in the charging circuit is required.
Mine looks like it's fading (around 12.3v) and my charging system won't put it up over 13v now.
Um .

Fairview:
Hi Madoc/Steve,

It's stood for 24 hrs and is still showing 12.7V. I haven't connected it to the bike yet in case that's draining it for some reason (although I don't think it is).  So it seems the battery is ok, should I run those tests again or can we go from here?

Thanks for your help.

SteveD CB500K0:
Yes.  Install it and check with no ignition on.

If the voltage sags quickly, remove the +ve connection and measure any current draw.

madoc:

--- Quote from: SteveD CB500F on September 19, 2012, 09:39:54 PM ---If the voltage sags quickly, remove the +ve connection and measure any current draw.

--- End quote ---

Let me explain that.
If you have a reasonable multimeter then it will serve as an ammeter (usually to 10Amp).
There are usually three terminals on the bottom of the meter, one black/two red.
One of the red one does everything voltage related and the other measures current/Amps
You swap the red lead over to the ammeter one and select the right setting on the meter (most have a dial for the different functiions - voltage, resistance,contunuity and current).

Disconnect the positive terminal of the battery. Connect the battery terminal to the positive lead of your meter and the negative lead of the meter the wiring (you just unscrewed from the battery) which is hanging in lose. You should get no reading.
Now turn on the ignition and current will flow through your meter and give a reading - that proves it is working. You can probably turn on your lights and see a larger number.

Don't hit the starter - it's likely to pull more than 10amp and blow the fuse in the meter.

Now, turn off the ignition and NOTHING should be shown.
If it does show a number then something is shorted somewhere and that will drain your battery over time.

I have a AVOmeter here .... fine piece of british kit. weighs a ton.

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