Part of the project on the 66 S Type is to wire in the Fog lamps that weren't originally installed. I've got the four position switch and even have the wires attached to the blue terminal on the 3 position switch. But I'll be danged if I can find the other end! My childlike mind rationalizes that they wouldn't produce specific harnesses for non equipped cars so the wires must be there somewhere.

Anybody know where they're terminated?

 

I was told the Red/Yellow striped wires for auxiliary lamps came standard towards the end of the S type's production, around 1967;

my 1965 does not have those wires, but curiously my 1984 XJ-6 does have them.

I had to make my own wiring harness and relay for the '65 S type, using instead 100 watt motorcycle lamps so everybody gets out of my way when I turn them ON.

Also I did not bother with the 4-position switch because it turns OFF the headlamps when you select the Fog lamps position, I wanted a lot MORE light, not less. So I installed a Lucas On-Off switch and made my own escutcheon cutting the center circle from a CD and printing my own legend to place behind the clear circle escutcheon.

 

Hmmm Thats an interesting detail! I don't remember that from our old 3.4. I may have done something to keep them on as my bride killed the battery in a traffic jam with the headlights, the fogs and the heater blasting back in the day. Whatever jumper I put in came back out after that

 

you probably jumped the switch but did not add a Relay ? That will kill the battery if not burn the wiring and the switch! Too much load.

if you find the Red/Yellow wires in your '65, please let me know where, I looked and looked and they are just not there.

Curiously, my '84 XJ-6 did the same thing, it turned the Headlamps OFF when I selected the Fog Lamps position. That was the American-market specification when fog lamps came fitted.

What I did in the XJ, was to install a European Headlights switch which has more positions than the American headlights switch, so it gives me all possible headlamps/fog lamps/spot lamps options. No modifications to wiring was needed, just replace the USA switch with the European switch.

 

I am rewiring my 62 and thought the headlights off with fogs on was unusual.
I am wiring with hi beam relay, low beam relay, fog lamp relay and a electric fan relay.
I also have eight fuse instead of two. Don't know why more didn't burn down.

 

that is the way all Jaguar shipped to USA were wired. Federal regulations.

 

That's the answer, The 3.4 was a RHD UK car.

I want to put relays on all the lighting up front. I'll have to look into it in more detail.

 

I've been searching automotive wiring sites with no good results so far. What's the typical solution for this bank of relays. I'm confident it can be done enatly, just haven't found it yet...

 

the diagram below is how I wired my spot lamps: I did not use any relays for the headlamps, not needed.

For the Relay I used a 1970's Marchal Relay kit that I had in my parts box. The Marchal instructions are also shown below.

does anybody remember the Marchal (French) spot and fog lamps? they were fabulous lamps.

 

I chose to use relays on the headlights to ensure good voltage to the
Halogen bulbs. I came from the dimmer to the relays using that wire to activate
the relay. The relays protect the switches from high voltage.