[xj40] 93 XJ40 fusebox woes

Anybody have any repair experience in cold solder or broken
solder joints in fuseboxes? I have heard that Jaguar
fuseboxes suffer from poor solder connections. Mine, left
side fusebox, all fuses work but the 12 volt output for the
a/c blower on the back of the fusebox is missing. I suspect
a break in continuity ie bad solder or broken circuit. I
already opened it up to show a startling array of resistors,
etc. Any good ideas? Jagbo–
Jagbo
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Depending on how good your eyesight is you might want to invest in a
jewelers loupe or a good magnifying glass and a solder sucker.
Check the suspect fuse joint and I would remove as much of the old solder as
possible and then resolder with new solder.
Regards Robin O’Connor
'92 XJ40 4.0 Ltr
Auckland NZ----- Original Message -----
From: “Jagbo” renchiro@verizon.net
To: xj40@jag-lovers.org
Sent: Friday, August 27, 2010 10:17 AM
Subject: [xj40] 93 XJ40 fusebox woes

Anybody have any repair experience in cold solder or broken
solder joints in fuseboxes? I have heard that Jaguar
fuseboxes suffer from poor solder connections. Mine, left
side fusebox, all fuses work but the 12 volt output for the
a/c blower on the back of the fusebox is missing. I suspect
a break in continuity ie bad solder or broken circuit. I
already opened it up to show a startling array of resistors,
etc. Any good ideas? Jagbo

Jagbo
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Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting
services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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In reply to a message from Jagbo sent Thu 26 Aug 2010:

When I had this problem on my '93, I found it was the most
accessible solder joint on the rear of the fuse box for the
fan motor that had the problem.

Was quite easy to clean up and re-solder the joint.

I’ve read of a number of folks here that have had to repair
the solder joints in their fuse boxes, and none have ever
noted having to dig any deeper into the fuse out logic’s
maze of resistors to make a repair.

Hopefully, you’ll find the same with yours.

Good luck!–
The original message included these comments:

Anybody have any repair experience in cold solder or broken
solder joints in fuseboxes? I have heard that Jaguar
fuseboxes suffer from poor solder connections. Mine, left
side fusebox, all fuses work but the 12 volt output for the
a/c blower on the back of the fusebox is missing. I suspect
a break in continuity ie bad solder or broken circuit. I
already opened it up to show a startling array of resistors,
etc. Any good ideas? Jagbo


91 XJ6, 93 Sov, 97 Sov – Driveway’s crowded!
Tampa Fl, United States
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In reply to a message from Jagbo sent Thu 26 Aug 2010:

Hi,
I think I’ve resoldered both fuseboxes in 5 or 6 jaguars
already. In two or three I had to cut out the metal bits and
separate two sides of the fusebox which was time consuming
but they all worked fine after rework. I had to replace two
or three diodes which burnt out and none of the resistors.
You can check the diodes and resistors with any multimeter
and it takes a minute or two and its always a good idea.
I have never removed the old solder. Adding a bit of new
solder and melting the old one should be enough but make
sure You’ve got a proper soldering iron and some flux which
is a must have thing.–
The original message included these comments:

Anybody have any repair experience in cold solder or broken
solder joints in fuseboxes? I have heard that Jaguar
fuseboxes suffer from poor solder connections. Mine, left
side fusebox, all fuses work but the 12 volt output for the
a/c blower on the back of the fusebox is missing. I suspect
a break in continuity ie bad solder or broken circuit. I
already opened it up to show a startling array of resistors,
etc. Any good ideas? Jagbo


katar83
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Hi - beeing a new Jag daimler XJ40 MY92 owner I noticed that my left headligt dont work. Right ones works fine.
Noticed that the Brown/orange cable at the front only has aprox 1 volt while right sida has 12volt.
I would say this is a cable connection/corrosin problem at the left side.

My next step is to dig into the left front fuse box to check the soldering and connection to the brown/orange cable. The normal fuse lid comes of fine but how to remove the side cover? I find one Phillips screw but I cant figure out how to remove the curved cover without damageing it.

Can someone please guide me on this.

post a pic, I can’t visualize what your issue is

What is the trick to remove the fuse box cover. Need access to check the connection between the fuse to the cable.

pretty sure after you remove the screw you just wiggle it out from under the door aperture trim - pull the upholstered trim out slightly and it should release the cover

Used a lot of power but coldn´t loosen it. I found a stuck point close to the mid sector.
Suspected a J-hook or similar behind the door opening as in new picture.

OK - if ther only is the Phillips screw, I keep on bending untill I make it free.

Before you go pulling the fuse box have you tried moving the BFM’s side to side to see if the problem moves?

1 Like

You’re going to have to ease that trim back to get the cover off.

Thanks for advise Robin - I actually ordered a used Lamp Control Monitor - Front and tested it in car without any different result. Main beam still dead. All other lights function.
After this I compared pin voltage difference left to right and found malfunction on left BRN/ORG cable pin (expected to supply 12 volt to the matching connector marked yellow on picture).
Maybe I can wiggle the cable (visual in engine compartment) between the fuse box and the LCM to locate a possibly bad connection in that section.

Problem solved - both sides are now working.

After remeasuring left and right sides voltage at the female connection in the black round unit I saw a differens at nr 7 (red ring). Left side 0,3V and right side 3,0V.

I started to dig into left side fuse box again and after some wiggling I tested the light and it is now working fine. Must have been a bad connection i this unit.
I am not conducting a resoldering at this stage - let it rest for the moment and will observe future behavior.