So I got the fast clicking when putting on my left turn signal on Thursday. Upon inspection the rear bulbs were not lighting up. I went and bought some new bulbs and replaced them. Later that day took a 30 minute round trip and all was well. On my way home as I was turning onto my street I got the fast clicking again. I put in another set of new bulbs and they were not working still.... I looked at the bulbs I just took out and they appeared fine which made me wonder if the original set were actually blown or not! When I got back to work this morning and fished the originals out of the trash (looked at them with a magnifying glass) and they were intact also! I put those back in and still nothing. Years ago I painted cars for 7 years, I was always a chevy guy and have very little knowledge of imports, let alone complex imports like this beast... That being said I have looked in the owners manual and on the door of the rear fuse box to see if this thing has some complicated fuse system that has a fuse for each individual area of turn indicator bulbs (front left, front right, rear left, rear right) and can't find anything about that either, in fact I can't even locate one fuse for brake lights... I'd like to think I'm not completely stupid with cars (I have done complete engine changes on my chevy's in the past) but this is a way different animal than I am used to! Am I missing something simple? I called my Jaguar dealer and the soonest appoint is the end of next week

 

If it worked with new bulbs, then failed again, yet both sets of bulbs are OK, it points to the bulb holder. You need to check you're getting volts to the bulb holder when the lights are required to be lit. Has the Owner Manual got a fuses location and numbering diagram ?

 

TedBr,

I've had this problem too and in my opinion, the design is too complicated for it's own good. Since you mention working on Chevy's I'm going to assume you are in the US (as I am) in which case there are two bulbs in the light cluster which both light up either indicating or braking. I have noticed that if just one bulb fails the other one will not work either as the control module has detected a fault with one of the bulbs. Unfortunately this is not a simple 12V supply running through a fuse straight to the bulb. I've also had the same issue when the bulbs have been fine but the connection has not been correctly detected by the light assembly/holder in which case I'd just take the bulbs out and re-seat them a few times and things would work fine for a while.

The last time this happened I suspected the issue was with some oxidation build up on the connectors and so I bought some dielectric bulb grease and applied it to the contacts on the bulb holder and the bulb. So far (knock on wood) I've not seen the problem come back for a couple of years now. You might want to check if you can see any oxidation build up and clean it off first. In my case I couldn't really see anything obvious but I cleaned the connections anyway.

This might not be quite the same problem you're having, but just thought I'd share my experience.

 

I'm not familiar with the X760 but a recurring theme on other Jaguar models has been tail lamp cluster issues caused by poor grounding. This is the X760 schematic:





The line I've highlighted in alternating Black/Red from the left tail lamp cluster goes eventually to a ground stud. An simple intermittent connection fault on this seems more likely than one on the input side from the Body Control/Gateway Module as module faults are usually permanent.

Graham