• 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 system not working

highbury731

Well Known and Active Website User
VOC Member
#1
I was most of the way home last night when I noticed that the lights had gone out (the bike's, not mine..). On checking, there was a faint glow. Battery (two Cyclons in parallel, 6V) run down, due to non charging.
The bike is in the shakedown phase, and was off the road for 30 years. I think the Lucas dynamo needs 'flashing' to wake it up.

I think that the method for flashing is to disconnect the dynamo from its drive. Connect battery earth terminal (in this case, + ve) to the body of the dynamo, and the other terminal to the D terminal on the dynamo, and let it motor for a few seconds. Is that correct?

Paul
 
Last edited:

greg brillus

Well Known and Active Website User
VOC Member
#2
If the battery is buggered you should fix that first or else the generator will be working too hard to charge it before it can supply anything else in the system. You will need to flash the field terminal on the generator, green wire, may need to clean up the commutator with a bit of emery tape held against while its running and clean off with a dust gun, or clean rag.
 

BigEd

Well Known and Active Website User
VOC Member
#3
....... I think the Lucas dynamo needs 'flashing' to wake it up.
I think that the method for flashing is to disconnect the dynamo from its drive. Connect battery earth terminal (in this case, + ve) to the body of the dynamo, and the other terminal to the D terminal on the dynamo, and let it motor for a few seconds. Is that correct?

Paul
Examples of how to flash positive or negative earth systems at the link below:
Flashing a dynamo
 

chrislaun

Well Known and Active Website User
VOC Member
#4
If you haven't had the dynamo to bits there's a good chance the commutator needs cleaning, I have found this is the most common fault, even if they are in use the surface can "glaze"if the dynamo isn't doing much.
A really in depth analysis of lucas dynamo's, how they work, what goes wrong, testing and how to fix them is on a site called "Matchlessclueless"
 

highbury731

Well Known and Active Website User
VOC Member
#9
If you haven't had the dynamo to bits there's a good chance the commutator needs cleaning, I have found this is the most common fault, even if they are in use the surface can "glaze"if the dynamo isn't doing much.
A really in depth analysis of lucas dynamo's, how they work, what goes wrong, testing and how to fix them is on a site called "Matchlessclueless"
I followed the excellent instructions on this site, and flashed the dynamo. Before running the engine up, I charged up the battery using a local garage's high power charger. It had no 6V output, so I rewired the two Cyclon batteries in series so that it became a 12V item. Both read 6.5V after an overnight trickle charge.
Following the excellent instructions on the 'Matchlessclueless' site, I checked the dynamo output, which read 4V at idle and 14V at a fast idle. Very good figures indeed - so good that it makes me think that the dynamo will cope very well if I fit a 12V regulator.
All I need is a working ammeter, and the system will be AOK.
So that amounts to a long-winded thankyou for pointing me in the right direction
Paul Standeven
 

highbury731

Well Known and Active Website User
VOC Member
#10
The charging system is still not working.
I have replaced the non-functional Lucas ammeter with a pattern one which I happened to have. It indicates discharge reasonably accurately, so that works....
So far I have proved that the dynamo is producing current, and there is continuity to the D terminal on the CVC. There is also continuity between F on the dynamo and the F terminal on the CVC. A and E also have continuity. So that must mean that the CVC is not working.
Is there anything I can do to the CVC unit?
Paul
 
Last edited:

chrislaun

Well Known and Active Website User
VOC Member
#11
There is information out there somewhere on repairing/adjusting them, though I haven't a clue where you would find it now, I saw some service type sheets years ago, the best thing would be to replace it with a modern electronic one, I use a DVR2 from Dynamoregulators.
 

highbury731

Well Known and Active Website User
VOC Member
#12
Several people have advised me to buy one of those. I suppose I am being perverse in trying to get the Lucas CVC working.
I hear that the contacts can get corroded, so it's a good idea to clean them with some emery paper, then run the engine up.
I can't think why Norton put the CVC under the petrol tank, so you have to take the tank off to access it, but need the tank on to test it.
Paul
 

stu spalding

Well Known and Active Website User
VOC Member
#13
There is information out there somewhere on repairing/adjusting them, though I haven't a clue where you would find it now, I saw some service type sheets years ago, the best thing would be to replace it with a modern electronic one, I use a DVR2 from Dynamoregulators.
I use a Dynamoregulators unit with a Fiat car dynamo. After blowing up a bunch of other units I can't fault this one. Cheers, Stu.
 

MartynG

Well Known and Active Website User
VOC Member
#15
There is information out there somewhere on repairing/adjusting them, though I haven't a clue where you would find it now, I saw some service type sheets years ago, the best thing would be to replace it with a modern electronic one, I use a DVR2 from Dynamoregulators.
see these attachments
 

Attachments

Top