Morris Minor Owners Club

re wiring colours.
There is a pattern to them.
For example, Purple is a fused permanent Live.
It goes to the Interior light (if fitted) and to the Horn.
Both of these have the switch after the equipment, rather than before it.
So Purple with Black trace, is a 'switched Earth', i.e. it is a live looking for a switch.

But there is no way to confirm just by looking, if the Purple/Black is the for the Horn or the interior light switches.

What I don't understand, perhaps John can help here, is why your indicator stalk has the Black/Brown and it's connected to the Purple/Black.

StillGotMy1stCar wrote: ↑Sun Feb 07, 2021 1:15 pm
No it doesn't, please don't. The Purple/ Black is the earth return from the horn and stays all by itself with the Brown/Black.
Read my previous posts, and check the wiring diagram.
Of course if the wiring diagram is wrong then it will need further investigation.

Regards John

But he's not got a horn button on the stalk, so why is it there?

Berni, Although the Brown/Black is on the Stalk assembly it is used for the Horn earth return.
It goes to a brush on the insulated slip ring of the steering column, from there up the centre of the column to a plastic insulator and spring to make contact with the Horn Push in the middle of the steering wheel to complete the return to earth when pressed.

The Tell-Tale goes direct to the bulb via the light green wire.

Regards John.

Right, now I get it.
Though I do wonder why it is Brown/Black, rather than Purple/Black....

Coincidentally, I've been trying to check it out online and a short while ago I found this NZ site
https://www.classiccarparts.co.nz/index ... duct_id=80
Which says:

Note: The original switches had 5 wires, which meant the earth had to travel to the switch via the steering column, after a period this can cause problems due to poor earth and higher resistance from this route, so this switch allows the earth to be made directly via the switch wiring.

That didn't explain it really, since it's not an earth for anything on the stalk, it's for the horn.
I'm quite happy with my SII slip ring....

trmorrisminor wrote: ↑Sun Feb 07, 2021 2:02 pm Ok many thanks John, just going by the previous comment my brown and black from the indicator is connected to the black and purple on the wiring loom, given there is another black and purple in the background ( which you can see in the pic) would these work in the same way if connected or is it possible the back and brown has been put in the wrong black and purple wire? I am asking all these questions as when i go to dads tomorrow and should it turn out that the wires into the flasher unit are all correct, atleast i have some other possibilities to look at as I am desperate to get this long running issue sorted tomorrow.
Many thanks
Richard

The wire in the background is a single colour Purple and is the supply for the interior light.
On the original loom the fuse box has two Purple wires, a thick one goes down to the Horn and a thinner one goes behind the dash for the interior light.

The Purple/Black is correctly wired in your photos.

Regards John

Many thanks John and Berni for the info. Will let you know how I get on tomorrow. Have a good eve. Thanks again.
Richard

StillGotMy1stCar wrote: ↑Sun Feb 07, 2021 1:15 pm

Chipper wrote: ↑Sun Feb 07, 2021 12:52 pm In your photo 2, I think the purple/black should be disconnected from the brown/black and re-attached to the stray purple/black bullet connector poking upwards in the background...

No it doesn't, please don't. The Purple/ Black is the earth return from the horn and stays all by itself with the Brown/Black.
Read my previous posts, and check the wiring diagram.
Of course if the wiring diagram is wrong then it will need further investigation.

I've just re-read Chippers post, I am sure the wire in the background is/should be a single colour Purple

Regards John

Ah, sorry - it looked like a matching purple/black, as it's partially obscured by the other wires in front of it. Quite difficult to fathom out other people's wiring, unless the car is in front of you and you happen to have a multimeter to hand...

Quick update , have worked on the van today, checked the wiring to the flasher unit and all was exactly as per Johns recommendation, so its not the wiring. Then I replaced the flasher unit with another new one and ......... bingo! Turned out that the fault was caused by a faulty flasher unit which bizarrely was new 3 years ago when fitted. As the fault has been like that for 3 years and was how I had the van returned to me once the new loom had been fitted it suggests the new flasher unit was faulty at purchase! Thanks to all of you for your help! Indicator light now stays off and only flashes when indicator is in operation!

Thanks for the update, it's always nice to know the outcome.