Frightening fact I have been driving mine for 50 years!!!!!!

Location: The Centre of the Universe

Thank you all for all help with my problem
With regulator is best to use
But i am a lot "more" confused than before
As i have had armature rewound / field coil and from 6 volt to 12 volt
Can i just buy a new regulator electronic or not And it will be up and
running, And were to buy one !
Help "Just going up the tower (i live in Blackpool)getting ready to
jump off

Location: United Kingdom

John is your dynamo still three brush or rebuilt as a two brush? If two brush the electronic regulator can,as mine is be fitted out of sight under the dash.The existing wiring can be cut within the harness to give the appearance of being original.

Location: Piddle valley, Dorchester.

Hi Paul Thanks for your comment's My dynamo is 3 brush
I live in Blackpool
Regards John.

Location: United Kingdom

Hi All,
Update on my dynamo sager,
I have had it wired to a 2 brush now
to my regulator that was there
"Good News" Its all working with a good charge
Very happy I am in love with my car again.

Location: United Kingdom

Now that my Forum access is recovered or restored, the following is a repeat of the essence of a reply emailed to Malcolm, for the possible interest of others.

No matter how carefully I prepare comments, seem to be misinterpreted, or offend someone! I have never said any arrangement wont work, just that some simple conversions often claimed either defy physics, or some key factor is not mentioned, or some feature unknown to me and not explained by others operates to avoid trouble.

I note Vince operates 12v with no field limit resistor, but winds back the third brush. If the field limited to say 6v the situation is much as original and the field should be OK. The added virtue that there is no power wasted, but without some exploration with a meter it is difficult to know just how much power is being fed to the field, whereas a resistor guards against excesss.

Vital essential provisos are often not mentioned which is why conversions are often so confusing. Some claim to connect the original 6v field directly to the 12v output and live! Power approaching the full original dynamo output would then be sunk into the field winding!

I think several readers confused reference to the field winding and the watts absorbed by it, with dynamo output. With the field, all watts supplied to it go as heat of the winding and any resistor, if any.
The armature situation is different from the field, the watts input come from the mechanical drive and the watts output is dissipated externally. It is just the armature current squared x armature resistance which produces damaging armature heating watts. Thus whether 6v or 12v heating is much the same for the same current, whereas the output watts is doubled, the whole basis of power output increases with 12v.

The total power generated is near output volts x gross armature current, the latter 2 amps more than the no load ammeter reading (coilo cars) plus field current, say 13 amps, about 90 watts at 7v. Probably needs twice this in mechanical watts to drive. If all stepped up to 13v with the same amps the power to drive also more or less doubles, which the gears will certainly notice.

I know this repeats points others have already made but it is all together.

Malcom’s simple Cornwall scheme and as advocated by Steven Hainsworth works reliably because field current is substantially as original, and the dynamo output amps are kept modest.

Bob Culver

Location: Auckland

not about regulators . but have just seen your youtube clip of silver 7 special .i think i now own that car AOK --- could you email me and perhaps answer a few querries for me
many thanks
clive

Location: United Kingdom

not about regulators . but have just seen your youtube clip of silver 7 special .i think i now own that car AOK --- could you email me and perhaps answer a few querries for me
many thanks
clive

Location: United Kingdom

As I said Nick I am a relative newcomer so still learning

Location: NZ