Re: XJS Electrical... how to diagnose
On Tue, 07 Jun 2005 14:27:06 -0700, WayneC <WayneC@linkline.moc>
>> Jaguars are famous for electrical problems
>> I am not familiar with your particular model ( I have a 78) but to
>> find the problem I would remove the fuse and connect a "sonalert" or
>> any type of buzzer to the opposite of the supply side.
>Interesting thought... but probably what I need is something that will
>start making noise when the power ceases (fuse blows) so I can figure
>out if something in particular is happening at the time it blows.
>Something like those old aftermarket buzzers that warn you when you've
>turned the ignition switch off but left the headlights on.
That is what a Sonalert is. They use to cost about $5.00 but today you
can get a buzzer 3 small batteries and a microswitc for a dollar . I
know, I just purchased 4 of them at the local dollar store.
>> Then insert de fuse and move all harness and the accessories that are
>> connected to that fuse. When the buzzer stops buzzing, you know you
>> have found the problem
>> If you have more that one wire connected to the non supply side of the
>> fuse, you could also insert individual fuses and this way get a better
>> idea on the location of the problem,
>Another interesting thought.
>> You can also replace the fuse with a 12Volt bulb (high current) and
>> move things around . When the brightness of the lamp changes you know
>> where the problem is.
>Or maybe add a light to the circuit and put it on top of the dash.
Yes , why not?
>> In any case, intermittent problems are hard to trouble shoot and in a
>> Jaguar are certainly not an easy task.
>> In certain rare cases when a destructive process is allowed I have
>> placed a much stronger fuse and look for smoke. I am not recommending
>> On Tue, 7 Jun 2005 16:17:55 +0000 (UTC), "Chris Booth"
>> <email@example.com> wrote:
>>>Check the junction of the wiring loom & the dash/ignition circuits ( 2 large
>>>plastic connection blocks) for corrosion.
>>>Had similar experience cost around £400 in towing fees & £300 to fix the
>>>mess the breakdown guy made of the wiring!
>>>chris b (XJ40)
>>>"WayneC" <WayneC@linkline.moc> wrote in message
>>>>On my 84 XJS, the circuit that includes the instrument panel and reverse
>>>>lights keeps blowing it's fuse, although I can't seem to ever catch the
>>>>exact moment it happens.... ie, I put a new fuse in and it may last a
>>>>half hour or a few days before I notice that the instruments have
>>>>stopped working again. I tried putting a new reverse switch on the
>>>>shifter, but that didn't fix the problem, nor can I pinpoint the fuse
>>>>blowing at the same time the shifter is used.
>>>>In retrospect, I have had a nagging electrical problem for many years
>>>>with this car, in that it would run the battery down if it sat more than
>>>>2 or 3 days without being driven; I had it in the shop several times for
>>>>this, and they removed the anti-theft system and disconnected the cigar
>>>>lighter, among other things, but the problem persisted. I got tired of
>>>>throwing money at the problem so I installed a battery disconnect switch
>>>>to use whenever I knew I wouldn't be driving the car for awhile.
>>>>Now recently I have this problem with blowing the fuse, and,
>>>>interestingly, the last time I parked the car it had a blown fuse again,
>>>>and I forgot to shut off the battery disconnect switch; it sat several
>>>>weeks, and the car started right up (no battery drain!)... so I'm
>>>>thinking whatever is blowing the fuse may be the same problem as the
>>>>battery drain problem (or may not, I suppose).
>>>>Anyone have any ideas on how I can track down this/these problem(s)?