The largest and best supported Jaguar cars enthusiast site on the Internet!

Serving Enthusiasts since 1993
The Jag-lovers Web

Currently with 3,166 members

Highbeam Headlamps Inoperative

Highbeam Headlamps Inoperative

Hodger, Dwyer

The wife came home complaining she couldn't dim the high beams on her '87 XJ6. Sure enough, no "click" from the dimmer switch. Tried the easiest fix first by removing the cowl and liberally squirting contact cleaner in there and moving things around vigourously, but to no avail. Began to remove the entire switch for examination, but it was getting too dark (and cold) to continue tonite. Before I go any further, has anyone had any experience with this switch, or am I better off to buy another one?

From Doug Dwyer

I think I would be more suspicious of the headlamp relay, but that's only my opinion. Recent and very good info on repairing the relay can be found at Near as I can tell, the only function of the column mounted high beam switch is to provide a ground for the control-side of the relay, thus "pulling-in" the contacts. So...... To narrow the problem down a bit, try this: Disconnect the blue/black wire from the relay. Arrange a 12 volt test light to check for ground and probe this wire. Now, exercise the dimmer switch back and should see the ground come and go. If it does, then I'd say the switch is doing it's job and your relay is stuck. If the ground stays constant when you operate the dimmer switch then I'd say you have a switch problem, as you've suggested. Easier to replace the relay than the dimmer switch, so, IMHO, this merits some double checking. And, with Mark's super explanation (link above) you can repair the relay.

From Darrin Hodges

I have just had the same problem, after checking the switch function as doug suggested earlier, i jumped in pulled the relay apart, only to find it ok. It turned out to be the brown wire that feeds +12v to the relay, it goes back underneath the headlight fusebox into a 3 way connector, which was gunked up, preventing sufficient current through to trip the relay. cleaning up the 3 way connector restored the relay function.


Please help support the move to the new site, and DONATE what you can.
A big Thank You to those who have donated already!



Go to our Homepage
Improve your Jag-lovers experience with the Mozilla FireFox Browser!

  View the latest posts from our Forums via an RSS Feed!

Jag-loversTM Ltd / JagWEBTM 1993 - 2024
All rights reserved. Jag-lovers is supported by JagWEBTM
For Terms of Use and General Rules see our Disclaimer
Use of the Jag-lovers logo or trademark name on sites other than Jag-lovers itself in a manner implying endorsement of commercial activities whatsoever is prohibited. Sections of this Web Site may publish members and visitors comments, opinion and photographs/images - Jag-lovers Ltd does not assume or have any responsibility or any liability for members comments or opinions, nor does it claim ownership or copyright of any material that belongs to the original poster including images. The word 'Jaguar' and the leaping cat device, whether used separately or in combination, are registered trademarks and are the property of Jaguar Cars, England. Some images may also be Jaguar Cars. Mirroring or downloading of this site or the publication of material or any extracts therefrom in original or altered form from these pages onto other sites (including reproduction by any other Jaguar enthusiast sites) without express permission violates Jag-lovers Ltd copyright and is prohibited
Go to our Homepage
Your Browser is: CCBot/2.0 (, IP Address logged as on 18th Jun 2024 05:40:46