[Mgs] 67 BGT steering wheel play

[PaulHunt73]

That would need two wires going through the stalk, they would have to be 
pretty thin, and the horns take quite a lot of current.  I was under the 
impression that the earth for the switch was fed up the metal tube of the 
stalk, meaning only one wire - purple/black - coming down and going out to 
the horns.  The main colour of purple indicates it is controlling a device 
connected to the fused, always live supply, and the tracer colour of black 
indicates that an earth is connected to operate the device.  Generally 
speaking when a wire colour was first used that was the convention, although 
if there were subsequent changes, as from 77 when the horns *were* backed by 
an earth instead of 12v, they kept the colour of the controlling wire.

PaulH.

----- Original Message ----- 
>I have a '69 MGB, with a stalk switch and the ground is at the horns. 
>Guess I should have said, "On my '69................"  Agree that the 
>wiring diagrams may contain a few errors. :-)
>
> CR
>
> CR
> On 8/30/2012 2:49 AM, PaulHunt73 wrote:
>> Not even most negative grounds.  The earth wasn't at the horns and 12v 
>> from the switch until the 77 year (although some schematics don't even 
>> show it that way then).  Until then the earth always came from the 
>> switch, picked up from the column shaft for the wheel centre button 
>> except for the 1970 year when it was wired to the column stalk switch.
>>
>> PaulH.