S1.5 Instrument Wiring

Technical advice Q&A

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mikebryan
Posts: 40
Joined: Tue Jun 14, 2016 7:52 pm
Germany

#1 S1.5 Instrument Wiring

Post by mikebryan » Fri Sep 13, 2019 12:01 pm

I have a question regarding the dashboard wiring for my 1968 S1.5 OTS.
Starting at the panel light switch, I have Red/Blue to the panel edge lights ( working OK ). Then I have Red/White to the instruments (working OK ). Then the confusing bit for me is a Red/Brown connected to the Panel Resistance ( connected ) then a Red/White to the 4 X PANEL LIGHTS. What the hell are these.???
I have Edge Lights and Instrument Lights only. I guess its me being to stupid to understand the wiring diagram, If anyone could help, would really appreciate it.

Thanks

Mike

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Robbiee
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#2 Re: S1.5 Instrument Wiring

Post by Robbiee » Fri Sep 13, 2019 5:53 pm

4 Red/white for central instruments
4 for speedo and revs??
Image
Robbie 1962 3.8 Coupe OSG 1962 OTS ODG

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Topic author
mikebryan
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Germany

#3 Re: S1.5 Instrument Wiring

Post by mikebryan » Fri Sep 13, 2019 6:49 pm

Hi Robbie

Thanks for that, tomorrow will check out my wiring against the diagram that you sent

Thanks again

Mike

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Robbiee
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#4 Re: S1.5 Instrument Wiring

Post by Robbiee » Sat Sep 14, 2019 8:59 am

Hi Mike
Let me know how you get on because I have to do mine at some point
I think the 4 small gauges are the “daisy chain” one with a spade connector
The one to the main speedo and rpm gauges go into a small diameter wrapped section of the dash loom and appear behind the main gauges
Robbie
Robbie 1962 3.8 Coupe OSG 1962 OTS ODG

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mikebryan
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#5 Re: S1.5 Instrument Wiring

Post by mikebryan » Fri Sep 20, 2019 9:47 am

Hi Robbiee

You were spot on with your advice with the wiring, it is as you described.

Best of luck with yours

Thanks

Mike

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Robbiee
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#6 Re: S1.5 Instrument Wiring

Post by Robbiee » Sun Sep 22, 2019 11:56 am

Great Mike
Glad to help
That diagram is worth getting
Robbie
Robbie 1962 3.8 Coupe OSG 1962 OTS ODG

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Robbiee
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#7 Re: S1.5 Instrument Wiring

Post by Robbiee » Sun Sep 22, 2019 12:01 pm

The best wiring diagrams come from Coventry Auto Components 0247 647 1217
e mail sales@xkparts.com . These books split the circuits down by function, such as panel instruments , starting , fuel , lighting, signalling , fuse boxes etc
Also the one I sent you a picture of is from Prospero’s garage in the US ..you can order it on line for your car
Robbie
Robbie 1962 3.8 Coupe OSG 1962 OTS ODG

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Tricky1.5
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#8 Re: S1.5 Instrument Wiring

Post by Tricky1.5 » Mon Sep 23, 2019 10:05 am

I have just completed the wiring in my Series 1.5. I used a complete Auto Sparks wiring loom. There were a few mistakes but I am doing a right hand drive conversion and the 1.5 is a bit of a pain as it can combine Series 1 and 2 components.
Try this wiring diagram
It’s the only one I needed. Keep in mind my car has the later rocker switches.

Image
1968 series 1.5 FHC

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MaroonV12
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#9 Re: S1.5 Instrument Wiring

Post by MaroonV12 » Thu Nov 28, 2019 8:10 pm

Tricky...I am halfway through converting my 1966 S1 2+2 to RHD.
I cant find anything really useful about the dash wiring loom on any forum. As you have recently done this, can you please share some advice.
I plan to use the original LHD loom and make any changes that may be necessary. Does the RHD loom still enter the car in the LH footwell and then run along the bulkhead to the RH side?
I have read that the LHD loom needs shortening but I am still puzzled by it. I just cant find any good photos/images of the loom for RHD. It would be really good to see a RHD loom laid out on the floor to get an idea of its route.

Any advice/photos would be appreciated

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johnetype
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#10 Re: S1.5 Instrument Wiring

Post by johnetype » Fri Nov 29, 2019 9:32 am

There's a series of articles on left hand drive to right hand drive conversion in the Knowledge Section which will help you along with loom layout diagrams. Some photos have been removed but the search function will still get you lots more information.

The wiring loom layout of LHD and RHD cars is fundamentally the same. The few differences are associated with the steering column and speedo/rev counter changing sides. Depending on the age of your car the order of the secondary gauges in the centre section may change but you can choose to leave them where they are.

Given the questions you're asking and the safety issues associated with altering 50 year old wiring I'd give serious consideration to buying a new RHD wiring loom from Autosparks.
John

1969 Series 2 FHC

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abowie
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#11 Re: S1.5 Instrument Wiring

Post by abowie » Fri Nov 29, 2019 9:29 pm

MaroonV12 wrote:
Thu Nov 28, 2019 8:10 pm

I plan to use the original LHD loom and make any changes that may be necessary.

Any advice/photos would be appreciated
My advice? Don't. You should consider that you're not going to be the last owner of this car, and when selling it the buyer will pick a price by judging the quality of the RHD conversion. If the wiring looks like a rat's nest it will make them have second thoughts.

You can buy all the looms individually from Autosparks. That loom is about £175. The wiring book is there too for £12.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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