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

Jag-lovers' Ebooks
- Jag-Lovers' xj40 Ebook -

6.7 - Lights On Warning Buzzer ( )

A simple 10 min. fix for anyone who has left their lights on and drained the battery.

Go to any electronics shop and pick up a 12 volt relay and buzzer. Wire the buzzer through the normally closed (NC) contacts on the relay, and wire one end of the relay coil to the negative side of the buzzer and a common ground. You need access to a circuit that is hot when the lights are on to wire the buzzer to, and an 'accessory' circuit that is hot when the ignition is on e.g. next to the lighter. The lighter has both an accessory circuit and an instrument light.

Pull it out of the dash and wire the (+) side of the buzzer to the light wire, that way the buzzer comes on when the lights are on. Wire the common ground to the ground on the lighter shell. Wire the other end of the relay coil to the hot lead for the lighter, so when the ignition switch is on the relay will be energized and the contacts will open, breaking the connection on the buzzer.

There is plenty of room to jam the stuff down into the dash before you replace the lighter. Epoxy glue can be used to glue the relay to the side of the buzzer and to cover the relay leads and solder joints


sepbar.jpg (3094 bytes)

This section currently maintained by Pascal Gademer; questions, comments, submissions and suggestions, email


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 - 2022
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 27th Jun 2022 05:52:44