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Author: Subject: Ignition Switch
joneh

posted on 28/12/20 at 06:25 PM Reply With Quote
Ignition Switch

Hi All,

One for the electrical experts out there. I'm struggling to figure out my ignition wiring as it's all disconnected and isn't labelled... This may all be a red herring if the switch is broken, however I have the following:

4 connections:

1. Thick Red = BAT
2. Thick Red = Fuse Box and Red/White = Seems to be Hazzard Switch
3. 2 X Purple/Black = 1 to coil and one to seems to be stalks..?
4. Green/Red = Starter Relay (via starter button) and Red/Black = Fuse box

Merit Malta Switch, which only switches on / off but has 4 terminals:

A. Bat
B. Always live
C. Switched
D. Seems to be nothing, maybe earth but never goes live?

Which order do I connect these up?

1A
2B
...?

Alternatively I also have a sierra switch and key, so could use this which has the traditional 3 clicks if this would be easier. I'll just join the starter button wires together and lose this. I assume the order I number the connections matches the clicks on the sierra barrel. i.e. 2 is accessories?

Thanks!
Jon

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obfripper

posted on 29/12/20 at 10:46 AM Reply With Quote
Going from your desciption,

-1 to A

-2 to B, basically all systems that need to be operable while keys are out the vehicle ie sidelamps, hazards, instrument illumination, brake lights&horn(not required but often are wired this way).

-3 to C
Green/red to C if you have a relay driving the starter solenoid, if direct to starter would likely draw too much current for the ign switch rating and would need separate feed.
Red/black to C

Your colours don't seem to match up with the lucas colours, i take it you have sierra stalks/lightswitches, and possibly a premier wiring loom which someone here is likely to have a wiring diagram for.
A lot of earlier sylva cars (mine incuded) used mini wiring looms as they had mini columns and were simple to cut down, a sierra loom is massive in comparison.

There may be a schematic for your switch on their website, i suspect terminal D is redundant for that model and is used on another model they sell as it is probably cheaper than retooling for different models.

Dave

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joneh

posted on 29/12/20 at 11:13 AM Reply With Quote
Thanks Dave.

I suspect it's a premier loom. I have Escort Switches on a Sierra column as I didn't fancy being impaled by the Escort column . The starter goes via a relay and no such luck on the ignition barrel website, but you suggestion sounds right to me.

I'll try your suggestions and see what happens, then convert it to the sierra barrel when I can source a suitable connector.

Thanks
Jon

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gremlin1234

posted on 29/12/20 at 01:17 PM Reply With Quote
the switch schematic is on page22 of
https://www.meritmalta.com/catalog/catalog-switches-and-horns.pdf

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joneh

posted on 29/12/20 at 01:41 PM Reply With Quote
quote:
Originally posted by gremlin1234
the switch schematic is on page22 of
https://www.meritmalta.com/catalog/catalog-switches-and-horns.pdf


Yes, saw that but it doesn't match up with what I have. I've wired it together as Dave suggested and various systems seem to be working and no fires!

Probably some blown fuses, dodgy earths etc to contend with but looking good. Thanks all.

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