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



I am now, replacing the (3) fuse blocks that are in the car. (1983 XJ-S) The main one under the dash on the driver's side, and one, on the passenger side. And, the one that is under the hood, for the headlights.

The first thing that I had to do, was to determine which of the fuses were,
a) battery fed, and
b) ignition fed.
What I found, was that on the main fuse block, there are three circuits that are battery fed.
The stock fuse block is a (12) unit device on the driver's side.

The new fuse block comes with a common buss bar that normally supplies all the power to the fuses.
The unit on the right side is a (6) unit device with (2) of the fuses fed by the battery.

The new fuse block also uses a common buss bar to supply all power to the fuses.
What I had to do to the main fuse block that I purchased, was to isolate the power supplies to the fuse block.
I now have 2 power supplies to the main fuse block.
4 fuses are now battery fed and the other 10 are ignition power fed.
What I did to one on the right side, was to isolate the power feeds also, 2 are battery fed and the other 4 are ignition fed.
The main and the right side blocks, were both purchased from a local NAPA store.
The one that is under the hood, was purchased from a local "KRAGENS" store,
that is an outlet, for "PAINLESS WIRE SYSTEMS".

The reason that I used a 14-fuse block unit, was that when you take the block apart you find that there is only one buss bar. You have to split the power feeds, so that it supplies power to both circuits.

The underhood fuse block is of a different type; namely all the circuits are fed by separate power. I had to purchase 2 units because there are actually 5 fuses in the circuit system.

The block is apart so that you can see the internal modification to the buss bar, 14 unit block.

This is the left side fuse block that has been modified. When you make enough units that are battery supplied, you will only have 8 unit for the ignition feed which is not enough because you need 9 units, that is why I used a 14 unit fuse block.

This is the block apart so that you can see the modification to the buss bar, 6 unit block.

The right side block is easier because there are only 2 battery feeds so you can use a 6-fuse block The underhood unit is different in that they all have separate feeds to each fuse circuit.

1. The 14 fuse block, is NAPA # FB6261

2. The 6 fuse block, is NAPA # FB 6415

3. The underhood fuse block, from PAINLESS WIRING, is part # 30002


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 - 2023
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 26th Sep 2023 22:52:11