BGM Voltage Regulator Wiring

Hi.
i have a 1973 Norton 850 Commando just recently restored. I have a new Solid State Type Voltage Regulator i want to fit i am not sure how to wire it up as it only has 4 wires there is a few more wires on the original type the BGM has 4 wires 2 x Yellow. 1 x Red. 1 x Black. i am assuming that the Black is a Ground (or earth). & The Red needs to be Connected to the + Side of the Battery the Yellows i dont know & then what to do with extra wires do i need to connect them to somewhere else ?.
i am new to this Forum any help on this will be gratefully appreciated
Thanks in Advance
Eric

I'm not familiar with the BGM regulator but the yellow wires should connect to the stator wires. The stator should have the same amount of wires as your regulator too.? Are you running positive or negative ground?

Welcome to the forum, EricWoods.

EricWoods said:

BGM has 4 wires 2 x Yellow. 1 x Red. 1 x Black. i am assuming that the Black is a Ground (or earth).

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If your Commando still has its standard positive earth electrical system, then, Red is the ground/earth. However, if your Commando's electrical system has been converted to negative ground, then Black is ground.

EricWoods said:

& The Red needs to be Connected to the + Side of the Battery

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Yes, but see above.

EricWoods said:

the Yellows i dont know

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Connect each Yellow wire to one of the two stator wires (one Green/Yellow? and one White/Green?)

EricWoods said:

& then what to do with extra wires do i need to connect them to somewhere else ?.

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Could you perhaps be a little more specific? Which "extra" wires? Colours? How many? A Brown/Blue will be the original "negative" wire (if +ve ground, etc. ).

The two yellow connect to the two wires of the altenator coils these are A/C so it doesn't matter which is connected to which.
Red is positive on the battery
black is negative on the battery

I say on the battery as your bike should be positive earth which it was when made but it may have been swapped to negative earth it some time. Also if you connect it straight to the battery there is less chance of old wire or bad connection causing loss of charging output.

"BGM voltage regulator"

Presumably, this is it?: http://www.bgmproducts.co.uk/spares/spe ... m0079.html

Hi Everyone.
Thanks for the info as i thought with the red and black . my other question is what about the additional wires i have on the old regulator do i just keep it on the bike to accomodate these extra wires or do i need to discard it altogether
Thanks
Eric

EricWoods said:

my other question is what about the additional wires i have on the old regulator do i just keep it on the bike to accomodate these extra wires or do i need to discard it altogether

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Some more detailed information about those extra wires would have helped, however the following is what I would expect you to have found connected to the old rectifier.

Brown/Blue. This is the DC output (negative). If you intend to connect the new regulator negative wire directly to the battery terminal (assuming it's still positive earth/ground), then the old rectifier Brown/Blue terminal can be isolated, otherwise it could be used to connect the new regulator negative wire.

Red/s. (Grounds) Securely re-connect to ground.

Green/Yellow? and White/Green?
If you intend to connect the new regulator AC wiring (Yellow) directly to the stator output wires, then the Green/Yellow and White/Green rectifier connections can be isolated. However, you may also find an additional Green/Yellow (from the harness) connected to the stator output Green/Yellow, this triggers the assimilator, so needs to remain connected to the stator Green/Yellow if the assimilator (and charge warning light) is in use.

That should be it, as far as the old rectifier wiring connections are concerned.

Hi L.A.B
Thanks for your help on the wiring. i haven't had a chance to get to the installation yet will let you all know if i get it right
Thanks Again
Eric