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#1 What is this Red/Yellow cable?
Posted: Sat Jan 20, 2018 6:23 pm
by Jeremy
Help please.... I'm fitting new harnesses, and there's a red and yellow cable emerging at the dash centre from the engine bay harness that i can't find in the wiring diagram. On the old harness it wasn't connected to anything and connector had been taped over. Any suggestions? Many thanks.

#2 Re: What is this Red/Yellow cable?
Posted: Sat Jan 20, 2018 7:28 pm
by Heuer
It is for the (optional) fog/spot lights which were never actual offered as an option by Jaguar. It would have connected to the four position light switch which later cars had.
#3 Re: What is this Red/Yellow cable?
Posted: Sat Jan 20, 2018 9:06 pm
by Jeremy
Thanks David! Interesting. Odd that Jaguar went on incorporating it into the harness, when leaving it out would have saved a couple of pennies.
#4 Re: What is this Red/Yellow cable?
Posted: Sun Jan 21, 2018 1:05 am
by andrewh
When I wired my 3.8 it was not in my original loom so reckon it's there to streamline the new looms for cars with fogs. Proved very useful for me as I needed power through bonnet plug for daytime running lights and had this feed already bound in the loom
#5 Re: What is this Red/Yellow cable?
Posted: Sun Jan 21, 2018 9:21 am
by ralphr1780
Heuer wrote: ↑Sat Jan 20, 2018 7:28 pm
It is for the (optional) fog/spot lights which were never actual offered as an option by Jaguar. It would have connected to the four position light switch which later cars had.
I am now replacing the 3 post switch with a 4 post one, for a quite interesting feature. On this 4 post the fog position activates fogs but cuts off headlamps, sidelights demain on... Will détail in a différent post.