6 v lucas regulator

[Tumbleweed]

Hi  ,  I have a 6v regulator  to fit on my a10 1959 ,   does it have to be 6v +  or will a 6v neg fit as well or does it matter anyway ?    Thanks

[bsa-bill]

I think it matters with electronic ones not too sure about our mechanical versions, however it is not a difficult job to Flash the dynamo so it reverses polarity for the bike

[Tumbleweed]

Thanks Bill

[beezermacc]

Not all electronic regulators are the same. Some -ve earth regulators require the dynamo wiring to be rearranged. I would advise to stick with +ve earth, make sure your dynamo is earthed and charging correctly and fit a +ve earth regulator. The old electro-mechanical ones like the MCR2 and RB107 are not polarity sensitive but the modern electronic regulators are supplied for either +ve or -ve earth and can't be interchanged.

[Tumbleweed]

Good ifo    thanks

[Tumbleweed]

i cant get any life out of this reg , the dynamo shoes 15 v on a test but when i connect to the reg  nothing comes out of it     
   ,   i dont know if the reg is duff , perhaps some one can tell me  how to go on       Thanks  TW

[Greybeard]

I cannot recommend this highly enough:
https://www.dynamoregulators.com/dvr2.php

I have mine hidden inside the gutted case of a mechanical regulator.

FIT. FORGET!

[Rex]

Yep, seconded. Avoid the similarly-named VReg2 though.

[trevinoz]

TW, the first thing to do is measure the resistance between "D" & "F" on the regulator.
It should be close to 0. If it is considerably higher, clean the regulator contacts.
With dirty contacts the reading is usually the value of the resistor but a lot of regulators have had a hard life and the contact spot for the resistor has become corroded leading to anything up to infinity.

[Tumbleweed]

Hi , Thanks for helping    i am not good at electrics but i set my multimeter to omms  200 on D & F  and it read 00.3 is that the reading i should have       TW

[Triton Thrasher]

Hi , Thanks for helping    i am not good at electrics but i set my multimeter to omms  200 on D & F  and it read 00.3 is that the reading i should have       TW

What does it read when you touch the two multimeter probes together?

[Tumbleweed]

Hi ,  003  -  004   

[trevinoz]

TW, that seems OK. Now test between "D" & "A" with the cut-out armature pressed in. You should get a similar reading.
I take it that you have tested for continuity on all of the wires on the reg.
With the engine running, connect the meter between "D" and earth on the 20V DC range.
If you get around the 7V mark, the regulator section is working.
Then test between "A" and earth with the battery disconnected. You should again get around 7V. If not, observe whether the cut-out armature is operating.
I have worked on plenty of these regulators and it is not uncommon for the shunt coils to become open circuit.

[Tumbleweed]

Thanks , i will try that today .   

[Tumbleweed]

 Many thanks Trevinos ,  i followed your instructions and there is a good charge but nothing going into the battery and nothing shows  on the ammeter , only when i switch on the lights and it shows slight discharge.  with everything connected up and revving up and no movement  to the ammeter or the lights .  i did get a puff of smoke from the reg i switched off  quickly ,  i think the cut out points got hot ,  but they still work  .    it must be my wiring where the problem is (not to the reg)      but ive gone by the book and everything works lights etc .  TW