The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: Elmondo on 18.09. 2018 18:52

Title: remagnetizing dynamo
Post by: Elmondo on 18.09. 2018 18:52
Hi Guys
It seems when you leave the bike standing for a month or so the dynamo needs re-magnetizing.
Has anyone had this problem?
If so what is the easiest way of doing this(fed up having to remove the seat etc)
Followed the workshop manual.....
Title: Re: remagnetizing dynamo
Post by: Triton Thrasher on 18.09. 2018 19:22
  Briefly connect battery live to dynamo F.  Just for an instant will do.
Title: Re: remagnetizing dynamo
Post by: RichardL on 18.09. 2018 19:31
Hi Guys
It seems when you leave the bike standing for a month or so...

I think something else is wrong. Winter is more than a month here (like four or five in Chicago) and I have never had to re-flash my dynamo. Not saying I know what the actual problem is.

Richard L.
Title: Re: remagnetizing dynamo
Post by: Bsareg on 18.09. 2018 23:44
I had this problem with a 6v dynamo coupled with an 12v electronic regulator (can't remember the make). Seemed the residual magnetism didn't produce enough power to "kick in" the field coil unless refreshed . Made my own unit and the problem diappeared, so a change of regulator may help.