battery discharge

Information relating to the Matchless G5 or AJS Model 8 350cc Lightweight
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paul6510
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Posts: 3
Joined: Tue Jun 25, 2024 12:43 pm
Location: UK

battery discharge

Post by paul6510 »

Hello I'm new to the world of classic bikes, I've recently been given my grandads old AJS model 8 .
it starts and runs fine but when I turn the headlamp on it then discharges the battery and the bike dies like there's no power. it then wont start until I have charged the battery up again.
as far as I'm aware the bike is standard and is still on the 6v system and I'm keen to leave it that way.

any help would be very much apricated.

Thanks Paul
g80csp11
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Posts: 1748
Joined: Mon Jan 01, 1990 12:00 am
Location: WEST SUSSEX UK

Re: battery discharge

Post by g80csp11 »

most likely the rectifier that turns AC to DC has given up or the Alternator is not producing power
when it starts on 'I' without lights does the battery voltage increase (use voltmeter on battery) it should give > 6.3V
'E' is only for emergencies and gives more alternator output but should not be used for too long
paul6510
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Posts: 3
Joined: Tue Jun 25, 2024 12:43 pm
Location: UK

Re: battery discharge

Post by paul6510 »

hello

thank you for that I will check again but I'm sure it was reading less than that when i checked.

thanks
paul6510
Member
Posts: 3
Joined: Tue Jun 25, 2024 12:43 pm
Location: UK

Re: battery discharge

Post by paul6510 »

also are the rectifier and alternator available to by still
g80csp11
Member
Posts: 1748
Joined: Mon Jan 01, 1990 12:00 am
Location: WEST SUSSEX UK

Re: battery discharge

Post by g80csp11 »

most people convert to 12 V with 74mm later stator and rotor + rectifier/rectifier box + bulbs
If you do that you disconnect the resistance wire that was originally used while lights are off

if your wiring is good you can still get a 6V rectifier unit , rotor etc.

https://rexs-speedshop.com/product/6-vo ... regulator/
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