Battery volts fluctuating G2

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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Joined: Mon Apr 28, 2008 11:44 am
Location: ESSEX UK

Battery volts fluctuating G2

Postby paul miles » Tue Mar 03, 2009 2:27 pm

Hi all,
After changing my battery I thought I would double check the voltage across the battery with the bike running, oh dear!... not to stable.
On tickover it fluctuates wildly between 6 & 10 volts all the time,increasing the engine speed of the bike doesn`t make much difference,the ammeter shows a charge of about 1 - 2 amps when riding,slightly more when the lights are on, now as an owner of several Jap bikes I know that voltage is usually stable around a couple of volts above the normal battery output, is this also the case with Brit singles????
If it is the same, would I be right in saying that the regulator may be playing up? possibly dodgy earth or poor wiring connection... etc etc etc
Your views and help as always is most welcome
paul M
PS Apologies for putting this also in general chat....Oh the joys of nightwork Doh

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Battery volts fluctuating G2

Postby SPRIDDLER » Tue Mar 03, 2009 2:41 pm

You wrote "After CHANGING my battery". Did you mean to write "After CHARGING.... " etc ?
I assume it's a 6v system - i.e. with a 6v battery.
Do you use a digital or an analogue voltmeter?
Do you actually have a problem (i.e battery going flat etc) or are you just being paranoid??

'Cos, if it aint broke...... so forth
I poke badgers with spoons.....from 2 metres.

Posts: 24
Joined: Mon Apr 28, 2008 11:44 am
Location: ESSEX UK

Battery volts fluctuating G2

Postby paul miles » Tue Mar 03, 2009 2:53 pm

After "changing" my battery. My last one only lasted about 8 months when at cell went down (Only showing 4.2 volts), I didnt think to check my battery voltage before as I thought that it failed because it was a cheapo one just to get me (& my bike)started, this one is a Varta so I thought I would check the voltage so as not to cook it.It may be possible that the power being put back into the battery was what bugge*ed my last one in the first place and not as I thought because of a quality issue?????
The volt meter is digital set to 20v for testing.
It is as you have guessed from the above a 6 volt system.
Paul M

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Location: KENT UK

Battery volts fluctuating G2

Postby Dougie » Tue Mar 03, 2009 7:46 pm

Paul, another tip is not to take readings from a freshly charged battery. You shoud always let it "rest" for 24 hours after charging before attempting to take readings.
Brothers Matt & Neal with joint membership

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Location: Norfolk

Battery volts fluctuating G2

Postby smsxr05 » Wed Mar 04, 2009 9:26 am

Check that the windings on the alternator have not shorted to earth, a common problem on this model.

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