Hallo guys (and girls),
I have just aquired a 1979 Daimler V12 5.3L LHD and I have some questions about the relays I see.
On the radiator side I see 4 relays.
In a workshop manual I could identify 3 of them. Near to the MPS at the left probably the Main relay for injection system; then an unidentified red relay with a 2 times a green/white wire, one Brown/grey and a black wire and a black loop wire. Next to the right of it probably the fuel pressure relay (4 contacts; 2 white/brown; one orange;2 brown/grey); next to the right the cold start relay (5 contacts) I presume.
Can anyone tell me what the red one could be AND where the starter relay is situated. There is also a relay juist front of the break fluid reservoir (5 contacts; 1 blue; one red; 2 blue/white;Onhe thick blue;2 blue/reds); whats that?? I dont find them in my workshop manual. Many thanks!

 

the Red Relay might be for the auxiliary fan (the electric fan located under the front bumper). I do not know if the Daimler V12 has one or two auxiliary fans.

these fans come ON when the thermal switching sensor at the bottom right of the radiator reaches a certain temperature. The Red Relay is part of the auxiliary fan circuit in all Series 3 XJ-6. The third component of the circuit is the 5th fuse mounted in the 5-fuse, fuse box located near the coolant expansion tank in the Series 3 cars.

if the auxiliary fan does not come ON at all, check the fuse first, then the Red relay which can be opened and the contacts cleaned.

 

Thanks for yr react.
The car has one aux. fan; and it is functioning; i'll try to deconnect in order to identify. Dou yoy hev an idee of what could be the relay I described front of the break fluid reservoir and where the ball/start relay is located.

 

if the relay you describe in front of the brake fluid reservoir is a large silver HELLA relay, it could be the Headlamps Relay, which is located in the same place in the XJ-6.

take some pictures and post them here.

what Service Manual do you have? do you have the Factory Manual? if not, you can contact the Jaguar Daimler Heritage Trust in UK for more help: click on the following link:

Jaguar Heritage

 

some pict. of the unidentified relays

 

I have bought the one from jagforums.com; there is no good wiring diagram either....

 

The silver relay that's almost dead center on the firewall is the starter relay.

Red relay near radiator looks like cooling fan, and the one in front of the master cylinder looks like the headlights, both as mentioned by Jose.

The one wayyyy low on the RH fender apron looks like the horn relay.

That's all I come come up with at the moment. This is an unusual car.....info, diagrams, etc might be a little hard to come by. I have a Ser III V12 parts catalog somewhere. I'll see what I can come up with on the other relays

Cheers
DD

 

picture Number 2 is the Headlamps Relay, the one with the red diode copied here.

 

this is the Horn / Claxon Relay.

Jaguar Cars always mounted the Horn Relay in the same location. The Horn Relay in my 1965 S type and and my 1984 XJ-6 are in the same exact location as shown in the picture.

if the Horn / Claxon is working, test by removing the Relay and testing the horn with ignition switch ON, if no sound when you remove the relay, it is the horn relay.

 

Doug is correct about the other large firewall / bulkhead relay.

 

Thanks f.yr. reply. What could be the function of a diode over there?

 

Sorry, I don't know, it is some type of Resistor, the same red diode is used in the Brake Pedal Stop Lights Switch.

 

Capacitor/condenser in those two locations. Not diode, nor resistor

Cheers
DD

 

Thanks to you all for your help !!

 

yes, neutrons, protons, and electrons, something like that.