Perhaps this site will be of some assistance:
http://www.mgcars.org.uk/MG_Elec-Tech/index.html
Hugh
> Don't have any MGC diagrams but I can't imagine what the purple would be for
> there, sounds like a PO addition. Does it come out of the loom or is it
> loose? If loose where does it go? Purple on the MGB is fused, always hot,
> for things like the horn and interior lights. Does the old switch have four
> terminals? Or was the purple attached to the same terminal as one of the
> others? Is the purple connected to anything i.e. what happens if you
> connect a fused 12v supply to it? Or does it show 12v when something else
> is switched on? If the front running lights didn't come on with the other
> three wires connected then maybe that wire (red on an MGB) is damaged up
> front somewhere and the PO ran in a purple to bypass it. In which case it
> should go with the red on the switch.
>
> ----- Original Message -----
> From: "JAMES SCHULTE" <schultejim@prodigy.net>
> To: <Mgs@autox.team.net>
> Sent: Wednesday, July 16, 2003 3:47 AM
> Subject: Wiring question/ head light switch 69C
>
>
> > I changed the head light switch on my 69 MGC Roadster today and discovered
> the original had 4 wires attached to it, 1- red 2- blue 3- brown 4- purple.
> The problem is the replacement switch only has 3 posts. The wiring diagram I
> have from the C manual only shows 3 wires and purple is not one of them.
> What is the purple for? I tried the new switch and everything worked front
> and back head lights tail lights, liscence plate lights only exception was
> the front running lights(turn signals did work). What is the purple wire for
> and can I double it up on another post, and if so which post?
--
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