Hi!

New here... my background: learnt to drive in a 1275 GT and did simple maintenance on it as a teenager. My first car was a '68 mini - always regretted having to trade it, but it couldn't cope with the miles and I couldn't afford to run two cars...

Anyway now (much) older with a teenage son of my own and starting a rebuild of a 1974 Leyland Mini Clubman 1000 (Australian model). Not much history with the car but it's spent most of its life in WA so very little rust, bad respray, fairly recent engine rebuild and runs pretty smooth, interior very shonky (complete with wasps nest), dodgy electrics.

Stripping things down to find out how much more there is to do and found the PCB behind the instrument panel burnt out... easy enough to replace but the connector plug/wiring loom has me completely confused.

FYI this is a 2 instrument binnacle (speedo/tacho on the left, fuel & temp on the right):


This is the back of the unit showing the PCB and the fried section between the connector and voltage stabiliser:


Here is the connector, pins 1-6 and 7-12:



I cannot track down a wiring diagram that matches exactly what I am seeing. The closest I have come is a Clubman/Clubman GT diagram referenced in another thread here:
http://www.ausmini.com/forums/viewtopic.php?f=2&t=95223&hilit=wiring+diagram+1976

Here's what I have and my identification against the wiring diagrams I have found and the PCB/instrument panel itself:

Pin --- Wire colour ---- Function
1 ----- Green/white --- R turn indicator
2 ----- Green/black --- Fuel gauge
3 ----- Green/blue ---- Coolant temperature
4 ----- Blue/white ----- High beam indicator
5 ----- Black ------------ Ground
6 ----- Green/red ------ L turn indicator
7 ----- Not connected
8 ----- Green ----------- 12V (ignition on?)
9 ----- Green x 2 ------- Presumably also 12V?
10 ---- Brown/yellow -- Alternator warning
11 ---- White/brown --- Oil pressure
12 ---- Red/white ------ Panel lights

I'm happy that the pins/wires 1-6,10 and 11 match the wiring diagram and trace in the PCB to the correct lamps/gauges (although the white/brown oil pressure wire looks white/black to me).

Here are the inconsistencies:
-- Pin 12 is definitely the panel lights but the wiring diagram says it should be red/green not red/white.
-- Pin 7 is not connected to anything on the wiring loom, but on the PCB the circuit from this contact lights up the red light under the speedo (ignition warning light?)
-- Pin 9 has 2 greens but there is no contact on the PCB
-- The wiring diagram has pin 7 as the blue/white high beam wire and pin 4 not connected.

Can anyone shed any light on the inconsistencies or my misunderstandings, please? I don't want to fry the replacement PCB!

The fuel/temp binnacle has the alternator warning light (lower left), oil pressure (lower right) and high beam (top). Can anyone tell me what the red light below the speedo should indicate? As I said it is not connected to the wiring loom (at present). I'd guess it is the ignition warning light, but I suppose it might also be redundant on my model?

Thanks in advance!
Richard

Solder a short wire bridging the gap of the burnt track and replace the voltage stabiliser with a 10 volt electronic regulator version. Should be all good then.

Hope this helps...

Here is another one

Your welcome.

_________________
Cheers Dave.

8 should be switched 12V (typically from fuse 3) which feeds into B on the voltage regulator. 9 you can see on the back of your gauge that there is no connection so the two green wires aren't doing anything. 7 I think should be your low beam, to illuminate when your lights are on?

Sent from my SM-A520F using Tapatalk

Thanks, everyone (and sorry not to have replied sooner - flat out at work pre-Xmas)

@wild_willy: will probably do that as a test before risking the new PCB

@fffffred (five-f fred?): the variety of wiring diagram variants is staggering. This one is a new set of similarities and differences to the wiring in my car!

@gtogreen1969: this is the closest yet - thank you! There is still the pin difference at 4 and 7 - there must be different PCBs for each model. However aside from that discrepancy (which is easy to trace on the PCB) everything else matches. I haven't found the "body junction plug" yet but will have a poke around this arvo...

@DTrain: I agree - thanks. I assume that the pin 9 connection was a convenient way to terminate or join the two greens, or perhaps for future use. The red light on (unconnected) pin 7 still has me mystified - do other Minis of this era have the red light below the speedo come on for low beam, and the blue at the top of the fuel/temp binnacle for high? Seems like an odd set-up...

I did find a wiring loom label which reads "LEYLAND AYG9504 SPHINX SYDNEY". Googling "Sphinx Sydney" brings up a war memorial, an aluminium manufacturer and a clothing business... Nada for "Leyland AYG9504" but I assume it's the part number.

AYG9504 is the Leyland Australia part number for the loom/harness.

Sphinx are (were) one of the manufacturers for Leyland. Some harnesses have CMAPL on them, indicating they were made by Cable Makers Australia Pty Ltd.

_________________
ex-NSW Police 1970 MK II Cooper S
VMCI #43

gtogreen simply stole the diagram fr9m another website.
The thanks should go to the person who spent the time to do the drawing.

_________________
Cheers Dave.

I'm happy to attribute thanks and acknowledge the source. Perhaps you could post a link to the original website?

The issue of plagiarism is a tricky one when things are posted and reposted in the public domain. Watermarking an image is one way to identify its origin, something I do on some material I post, but not all.

In this case, since the originators name and contact details are in the actual diagram I took this as sufficient acknowledgement of the source.

_________________
ex-NSW Police 1970 MK II Cooper S
VMCI #43

I originally drew the drawing for my own use but after several requests it was put up on the Vic Mini Club website.
https://5f20f8e4-3efc-4147-a491-c143d7c ... dcc35d.pdf
It is now available on this forum in the "How to" board for all members to use freely.
viewtopic.php?f=25&t=100631

_________________
Cheers Dave.

Thank you

I have just had a problem with the fuel gauge on my 1972 Clubman. The gauge stopped working and the fault was identified as a broken copper track on the PCB plastic strip just where the plug connects. An attempt to solder it was unsuccessful as the copper strip just came away from the underlying plastic. A jumper wire from the gauge to the cable fixed it.

Someone has already noted the variations in colour coding. While the standard Lucas code for instrument lights is red with a white trace, the Mini seems to have red with a green trace.