all forum threads i found are very old and people who was offering this already inactive, so its nice to check if anyone is doing that now.
i need facelift (1992 5.3) harness, sngbarratt seems to have only pre he one, i also emailed autosparks UK, but didnt get a reply back yet, so decided to check here.

Thank you

 

Moss Motors lists s I me harnesses. I'd at least try there.

​​​​​​​Jon

 

Checked, they dont have it either(

 

Don't fancy trying it yourself ?

Pretty much everything is available in the UK at least, not sure about where you are, it really is not so hard to do if you're methodical and take your time. The only thing I did on mine is remove the main connector on the car itself and replaced with two supaseal 4 pin connectors as the connectors on mine were molded onto the cable, but I don't know what the '92 has.

Did mine in a couple of lazy afternoons can probably dig out my shopping list but not entirely sure if the connectors on the '92 are different to the '87 - don't think so but you never know

 

i would love to do that myself to be honest, but you cant find anything where i live, i really dont wanna spend 10+ hours doing online shopping, waiting 2 weeks to get them and then realize i forgot smth and wait another 2 weeks just to get started. =( Also i dont know what to buy and where...

 

I can only imagine the frustration and I understand the predicament - no matter how carefully I order things I always end up needing something else.

 

I’ve successfully made harnesses for two earlier V12s but the ‘92 was a fiasco. Never could figure out what I did wrong. Ended up getting a used harness at great expense from jagbits.

Next time I’ll go with the Mobek kit, which is very expensive compared to what a harness alone should cost, but replaces all the electrical antiquities. https://mobeck.com/jaguar-v12-efi-kit/

 

This might be the one? https://www.autosparks.co.uk/jaguar-...ring-harness-1

Autosparks has everything you need in terms of connectors. I have bought an complete E Type harness from them and was impressed by the quality. I'd certainly ask them for what you need, as they can custom make one for you.

 

wow, how is that? im looking at it and it doesnt look too complex, comparing to older cars, it just has few additional sensor wires.

i dont trust to be honest 3rd party efi kits, i have holley efi on my charger 71, and its a pain in the *** if smth is not right. i even consider going back to carbs.

 

I watched a You tube video by Camp Chaos Chronicals on how to rebuild the EFI harness. They even tell you where to get the parts. As I stated in my Project Phoenix post, it cost less than $100 with connectors and wire, and only took 3-4 hrs. It really is a doable project, just go slow, and double check.

 

i watched it s well, seems to be straight forward, except that i havent found any proof someone did it for a facelift car, and few times i have seen that people failed, as Jagsandmgs few posts above.

 

Ah- understand. That’s a bummer. Wonder what is different. They seem pretty straightforward.

 

The older Lucas style is fairly simple. I had no problem on a 76 and an 83. The 76 had been on fire so even with no template I could figure it out. The ‘92 merges the injector harness with the rest of the engine harness into one big harness. You.cannot get all the connectors. The injector connectors are the same, but the rest are not.. There are two very long coaxials that go under the left intake manifold so you have to take that off to fit it. What did I do wrong? Who knows. Everything tested out logically. It just didn’t work.

 

I would recommend anyone planning such pre-emptive work not be too obsessed with replicating the poor habits of the 90's unless one of those originality obsessives. Modern production techniques stopped doing consolidated harnesses in favour of harneses per purpose - i.e modern engines have a harness for the engine (mostly) or for each bumper, each door and so on, constraining yourself to the connectors and quality of the day denies you the benefits of modern materials and methods. Even the PVC sheathed stuff installed on these cars hardens over time as a material PVC unless adequately insulated has a very limited lifespan under a hood / bonnet.

There are plenty of multipin plug types available designed specifically to keep dirt and moisture out that are significantly better than the stuff they used in the 90's, there is cable of much better quality and more suitable for underbonnet use available, even materials for protecting harnesses has improved.

Even the 80's harnesses have a plug that cannot be obtained - the bullet connectors for the injector harness are encapsulated in some sort of plastic / rubber, the bullets cannot be removed without destroying the connector so they cannot be replaced - mine were discarded.

If this is the situation on the 90s XJS's I'd trace the wires into the harness and introduce connectors of my choosing at some point. If there are co-ax type cables in there for sure I'd not put them back in but would segregate - again there are plenty of signal grade shielded cables available way better than what Jaguar used - don't forget nearly all modern vehicles have a number of digital 'communication' grade circuits.

 

Very good point(s). I don't want to hijack the thread, but is there any consensus on the best type(s) of wire and connectors to use - particularly in the engine bay?

 

Don't know about consensus you will probably generate as many opinions as respondents.

For the injector connectors you have few choices - believe they're commonly identified as Junior Timer connectors. For any other underbonnet wiring I do these days I use silicon insulated multistrand cable exclusively, elsewhere I use thinwall PVC. PVC wiring really isn't rated for extended use at high temperatures > 80°C and the plasticisers leach out - the hotter they are the faster it happens which is why they go hard. The connectors I mostly use are the Superseal types though I do use plain spade types (not the pre insulated junk) and I crimp exclusively and sleeve but I prefer to avoid, it is only where items such as water temp sensors give me no choice that I use them, I do not use solder anywhere (solder creates rigidity and stress points) - through crimps and adhesive lined shrink sleeving where I don't want it 'disconnectable'. I will not use insulation displacement type connectors (Scotchlock blocks for instance - lazy and guaranteed to fail, should be banned). The legacy connectors allow moisture ingress and that can wick up the copper strands and then corrosion sets in that isn't really obvious.

I install all my wiring in anti abrasion sheath also and close that with adhesive lined shrink sleeve, where I use tape which isn't often I use the cloth self amalgamating tape from 3M, they also do a very good cloth looming tape. Then there is the clipping and support that I try to ensure is at least one clip per 30cm or on each side of a bend / radius.



I've avoided posting links to the stuff I use since links always end up broken.

 

For reference, here's a recent and successful engine wiring harness renew write up on a 1992 Facelift model.

https://forums.jag-lovers.com/t/1992...rebuild/414298

 

Hi Mouserider

Safari used to make this stuff and probably still does

 

thanks! Wrote him a message!