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' Saloons Ebook -

17.1 - Positive to Negative Polarity Swap ( Frank Benschop,  )

The following are instructions on changing to negative ground for a positive ground saloon:
* Turn the battery around, or preferably, find one with the poles reversed (limits the possibility of shorting on the back of the open bonnet).
* Reverse the wires on the ignition coil.
* Inspect your fuel pump for a capacitor (common on later Mk 2/240/340/S-Type). If there is no capacitor, go on to the next step. The capacitor in the fuel pump is a one lead axial type. The lead is the negative pole. The positive pole is the housing, which is earthed by the attachment clip. There is no simple way to 'reverse' it. Replace the capacitor with a 50uF electrolytic capacitor of at least 20Volts with about the same physical dimensions. Solder the positive pole to where the old lead was attached. Solder the negative pole to the attachment clip or other suitable earth.
* Run a wire from the positive post of the battery and briefly "zap" the field terminal of the generator (reverses the residual field).
* Reverse the wires on the ammeter (hard to get to on a Mk 1).
* For Mk 2 and later cars, the clock in the rev counter should be disconnected. Otherwise it gets fried. No easy way to convert it. This will probably not be a problem in most cases as the clock in most cars is already broken.
* If the car has an original radio, you will need to either disconnect it, or electrically isolate it from the rest of the chassis (including the antenna) - Mark Stephenson.
* Start it up and go for a drive.
There is no need to fiddle with the wires to the starter, fan motors, etc. They seem to sort things out on their own. There is some indication that the washer bottle mechanism in the Mk 2 and later Saloons is polarity sensitive.


 

sepbar.jpg (3094 bytes)

This section currently maintained by Pascal Gademer; questions, comments, submissions and suggestions, email pascal@jag-lovers.org

 

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 - 2017
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 (http://commoncrawl.org/faq/), IP Address logged as 54.224.187.45 on 18th Nov 2017 02:38:32