Mk2 wiring help needed

[Dedubyah]

I am getting towards the end of my engine rebuild on my new to me 850 and have installed a Pazon Altair and reg/rectifier however I never took the time to check all of the electrical functions prior to tearing it down, other than starting it. Firstly, the headlight and indicators weren't working and when I removed the rubber cover from the master switch, I found it only has 3 sets of terminals, which I read ,was only on the 1971. I have ordered a new switch but in the meantime have connected the power in (Blue/Brown) to the power out(White) but when I power the Blue/Yellow or Brown/Green, I see voltage when probed to the frame, also can anyone tell me which connectors fit where on the 3 way headlight toggle switch? Help appreciated, thanks.

 

[Lineslinger]

Take pictures during disassembly, of everything. That gives you some basic form of starting reference.

 

[L.A.B.]

I found it only has 3 sets of terminals,

To use the three terminal switch plug the blue/yellow onto terminal three with the brown/green.

also can anyone tell me which connectors fit where on the 3 way headlight toggle switch?

Should be a two position switch but connect blue/yellow to terminal four and blue to terminal eight.

Andover Norton - LIGHTING SWITCH 2 POSITION 34660 LU31780 (LUCAS) - 06.8024

LIGHTING SWITCH 2 POSITION 34660 LU31780 (LUCAS)

andover-norton.co.uk

 

[Dedubyah]

Thanks for that, with the blue/yellow on T3 I have power to the headlight terminals, the high beam light comes on, I have 5ohms from the headlight connector earth to the battery but no headlight (bulb lights directly from a battery). When I replace it with the blue/green, I have a tail light, the brake light works and when I probe to earth it shows voltage. Does this indicate a short to earth in the brown/green circuit? It hasn't blown a fuse. I have only a basic understanding of electrics so any help is appreciated.

 

[L.A.B.]

with the blue/yellow on T3 I have power to the headlight terminals, the high beam light comes on, I have 5ohms from the headlight connector earth to the battery but no headlight (bulb lights directly from a battery).

Sorry I don't quite understand that, you say the headlamp circuit works then you said it only works powered by a battery?

Brown/green powers the tail lamp, pilot light and instruments. The brake light should work from white on T2.

If it hasn't blown the fuse then it's probably not a short circuit but I'm not sure what the problem might be if there is one.