The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: emilios on 11.10. 2012 16:25

Title: charging or not???
Post by: emilios on 11.10. 2012 16:25
Hi
I was fixing the charging wiring on a friend triumph 6t 1961..
6v battery with alternator and one old 4fin rectifier...
I did the wiring and turn the key on...i had discharge on ammeter....correct
I kickstart engine and rev a little and i had good charge on ammeter..
The problem is that when i put a multimeter on battery shows only 6.1 without engine running and 6.2 6.3 when engine is running..
Is that charging ok or should i do something??
Thanks
Title: Re: charging or not???
Post by: fido on 11.10. 2012 17:06
I would start by replacing the old selenium type rectifier with something more modern, either a silicon bridge rectifier block or the A REG SIX device from Goff:
http://www.norbsa02.freeuk.com/
Title: Re: charging or not???
Post by: emilios on 11.10. 2012 17:47
I will replace the old finned one with a new bridge rectifier that i have to see if the problem will solved
Title: Re: charging or not???
Post by: fido on 11.10. 2012 20:09
Sometimes the magnets in the stator can lose their magnetism and need re-magnetising but see how you get on with the new rectifier first. It should be charging at over 7 volts. Did you measure the voltage with the lights on as well?
Title: Re: charging or not???
Post by: emilios on 11.10. 2012 21:06
I just find that his alternator is 12v..
hopefully he had store his old one(6v) so i replace it...but i couldnt fire engine cause it was too late..
i will check it tomorrow...
i dont know if the problem was the 12v alternator but to me it doesnt hear correct..
Title: Re: charging or not???
Post by: emilios on 13.10. 2012 17:20
I fit the old 6v (3 wire) alternator and now bike is charging ok...
But when i run bike about 1km it start running on one cylinder...strange cause when i leave bike to get cold it run good again for 1km...then the same..
What do you all think is the problem??
Coil, condenser??

P.S. bike is distributor model.

Title: Re: charging or not???
Post by: fido on 13.10. 2012 17:32
Unlikely to be coil or condenser if only one cylinder was affected. You could swap the spark plugs and see if the fault moves to the other cylinder.
Title: Re: charging or not???
Post by: muskrat on 13.10. 2012 19:23
 Sounds like a coil to me.
Cheers