• Welcome to the website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Hon. Editor and Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this website.

    If you have previously registered to use this forum, you should log in now. CLICK HERE.

    If you have never registered to use this website before, please CLICK HERE.

Misc: Charging Systems Regulator for MZF-12A dynamo

Paul Coene

Well Known and Active Website User
VOC Member
My Rapide has a Chinese dynamo type MZF-12A. The fuse was burned out and after replacement, the battery didn't charge any longer. I cleaned the commutator and tested the dynamo. It seems to work well now, so I think the (electronic) regulator is broken. (I don't know how to test it though). Is it possible that a malfunctioning dynamo blows the fuse and/or the regulator ? And does anybody know what type of regulator is required or advised for this kind of dynamo ?
There's not much information on it:


regulator.jpg

Thanks in advance,
Paul.
 

mercurycrest

Well Known and Active Website User
VOC Member
You need to look at how the field leads and armature leads are connected to the brushes so you can determine if the field is internally, or externally grounded. Then you will know which type of regulator you need. To make the generator "motor" did you ground the "F" lead from the generator? That would be an externally grounded generator. "F" to "D" is internally grounded.
 

Marcus Bowden

VOC Hon. Overseas Representative
VOC Member
I've always tested with D & F together to the positive battery terminal, negative to earth and should motorise in direction of driven rotation and will be polarised for negative earth at the same time, it's now good to go.
bananaman.
 

Paul Coene

Well Known and Active Website User
VOC Member
@ mercurycrest and Marcus: I found some information on internet:
When I connected both terminals W and AW together to the +terminal, and the -terminal to the earth, the dynamo was running fine.
Next, I mounted the dynamo to the engine again and measured the tension between A+AW and earth (battery disconnected) at "fast" tickover: 7 to 10 V. Is this test good enough to decide that the dynamo is ok and that the regulator must be faulty ? Is there an easy way to test the regulator ?
(Sorry, I don't know much about electronic equipment)
 
Last edited:

Marcus Bowden

VOC Hon. Overseas Representative
VOC Member
Sorry, I'm no expert on electronics although had to get to a certain standard when doing my engineering tickets of competency that has gone the same way as the majority of stuff I learnt at school & college. Sucket and see is the advice I give now but be ready to pull the plug when you see insulation leaking smoke.
bananaman.
 

Simon Dinsdale

VOC Machine Registrar
VOC Member
VOC Forum Moderator
Sorry, I'm no expert on electronics although had to get to a certain standard when doing my engineering tickets of competency that has gone the same way as the majority of stuff I learnt at school & college. Sucket and see is the advice I give now but be ready to pull the plug when you see insulation leaking smoke.
bananaman.
When I started my electrical apprenticeship the first two rules I was told by the instructor called Jeff was:
1. When you see smoke it too late
2. Getting the smoke back inside the wires is the tricky bit.

Simon
 

Paul Coene

Well Known and Active Website User
VOC Member
Thanks Vibrac, but I've found that article already. Very good information indeed. What should I do without internet nowadays ? Actually , it is not the first regulator I'ld have to replace and, asking for advice about testing methods, I never got any other advice than: try a new one and you'll find out if the old one was faulty.
 

Latest Forum Threads

Can't Find What You Need?

Buyer Beware: Fake or Real?

The Mighty Garage Videos

List of Forum Categories

Top