Hi all,
1978 V12
Does a table exist of all the colour codes of the wiring and their purpose ?
I have a table for my 78 MGB and it is almost as useful as the cars wiring diagram.
I am trying to identify two wires on the inside of the RH guard near the the throttle body.
one is brown with a black stripe the other is yellow with a grey stripe.
they are about 200mm long ending in a terminal
with thanks
Al

 

Alan,

I have a colour chart somewhere, and will dig it out and post it to this thread.

It is ony a colour chart, not what a specific colour "may " be associated with.

MEMORY?????, on those 2 wires, and it is 6cyl related.
Some markets had a vac "dump" valve via an oil switch, whereby when the Ign was turned OFF, the Brown/black wire became live, and that wire went one side of this valve. The earth side was via the specific oil switch {reverse to standard) which had an earth path WITH oil pressure, thus activating this valve to prevent run on with the S2 Carby cars. Once oil pressure dropped, the switch no longer had earth, so the valve closed. When the Ign was turned ON, that wire was dead, it was only live in the OFF position.

NOT reliable, and I removed them on all my S2 6 cyl cars.

NOT aware the V12 cras still had that part of the loom, and my V12 is miles away, so looking is not happening, However, I do seem the visualise 2 errant wires tucked under the battery (RHD car of course), so maybe they did??

 

Found it.

Hope it clears the mud somewhat.

 

I've seen many "British Wiring Colour Charts".

In my experience the British wiring schemes are not quite as universal as many would like to think . Plus, the newer the car, the less 'universal-ness'.

Broadly, I've found them generally useful for basic electricals--- lights, wipers, instruments, and the like. When you start delving into fuel injection, emissions equipment, trip computers, climate control....stuff like that.....all bets are off.

Cheers
DD

 

Thanks all,,
yes, as I said somewhere I came across a table for my MGB that listed all the wire colour combinations and the function that each colour is associated with. I found it very usefull when delving into it's electrical Lucas mysteries. I gather a lot of the relationships were standard across the Leyland range of vehicles.
Of course the Series 2 Injected V12 is far more complex.
I am coming very close to finishing the reassembling the engine on the Daimler that has been apart for years, adding fluids and attempting to start it.
The large pile of plumping, pipework, accessories and various components on the floor is getting smaller and the engine bay is getting more and more full. There has been much head scratching as to which bit goes where and which hose goes to which connection. I still have a couple of 'loose ends' with the vacuum hoses that I will make a seperate post requesting advise. It is amazing how the basics are rather simple with a whole heap of additional stuff dumped on top ( mostly anti pollution equipment). I have tried to simplify the engine by removing the EGR and air injection.
I've all ways driven British cars and have three Jags at the moment. I am well familiar with their quirks and oddities and generally happily live with some poor design features but I must confess the layout in the engine bay of the 12 cylinder has really tested me!
I do hope it starts.
Much thanks for all advise this forum provides
Al