11 replies to this topic

[giacomo]

It's a 1984 mini Mayfair.



Hey guys, after spending 2/3 full weekends of sorting my wiring out I've accepted defeat

So the story goes, I've put an auto plas dash in the mini and it's turned out to be more hassle than it was worth lol used the mini spares conversion loom and fitted toggle switches in place (flick up and down like on mk1's ect) so after sorting my headlights, rear lights and fog light out the hazards work. It's now that when I indicate left or indicate right the hazards just come on. So I have now 3 ways of switching the hazards on and still no indicators.

Any body got an idea of what this could be? My dads not to sure just like me.

Any helps appreciated guys

cheers Giacomo

[AVV IT]

I'm not sure if this would cause what you describe or not, but is it possible that you've put the plug on the back of the hazard switch back on upside down on the switch? (if that's actually possible) 

 

From memory, the top four pins on the back of the hazard switch act like a sort of hub for the indicator circuits, whereas when the hazard switch is pressed down, the bottom two pins take a feed from the hazard flasher and send it to the indicator stalk, effectively over riding the indicators. What I'm thinking is that if you had the plug on the switch upside down, then the hazard light circuit would be live even when the switch isn't pressed down, and would also be controlled by the indicator stalk?.... I think!!

[Ethel]

That's essentially it, remember the indicators should be ignition dependent and the hazards not - helps to identify which flasher is flashing.

 

It's an 8 pin grid - the bottom row of 2 connect to allow indicators, the next row has no pins. the top 2 rows all connect for hazards (the switch disconnects the bottom row at the same time). The 4 hazard pins are: a supply, the feed to the bulb in the switch (small spades on the side), one pin for each side - green/white & green/red. The green/white & green/red must be connected for all four to flash.

 

How have you wired your indicator warning light(s) on the dash, that another possibility for inadvertently wiring both sides into one.

[KernowCooper]

If you have replaced the standard Hazard rocker switch with a flick switch how is it wired ? or have you still retained the Harard switch? The Mk1 never had hazards and the indicator circuit was pretty basic.

 

Bit more info what switch your using for hazards and how its wired now would help, looks like the wirings not correct on the switching with your modified dash

 

Here is how the circuit is wired on the vehicles with hazards, so you can see to switch position/terminals

Attached Files

•  Indicator-Hazard Wiring MK4.png   75.52K   21 downloads

[giacomo]

Cheers for the help guys :) so how would you wire up the hazards to a toggle switch?

[dklawson]

Cheers for the help guys :) so how would you wire up the hazards to a toggle switch?

 

Well, you wouldn't really use a typical toggle switch.  As was mentioned above, the hazard switch is fairly complicated.  It has to...

• pass current to the turn signals when in the "off" position,
• break the current path to the turn signals when "on",
• join the left and right side indicator lamps when "on",
• and pass that lamp current through a flasher to make the hazards blink.

That's why the switch has lots of terminals and is complicated inside.

 

Your best option is to select a hazard switch that was used in some other car of the late 1960s early 1970s if you want a retro look.  There were Lucas pull switches and rocker switches that I know of.  I cannot remember any cars where the hazards work by toggle switches.  If I think of a car that had a toggle hazard switch I will post that information here.  

 

EDIT:  I did some Googling for hazard switches and switch kits.  If you want to try a few things with toggle switches, see the link below.  The link is for a "kit" that uses a simple switch with a (kind of) non-Lucas wiring scheme.  Note that the switch linked below includes a schematic that you can look at.  If you pay close attention to what they are showing and customize it a bit, you MAY be able to make your own flasher circuit that works off a double-pole toggle switch.  Have Tiger and Kernow give this a look and see what they say.  I would build this circuit and bench test it before committing to modify your car's wiring.

http://www.carbuilde...zard-switch-kit

and the schematic...

http://www.carbuilde...switch-kit.jpeg

 

Also see the two threads linked below which involve kit car owners wanting to do just what you are asking about.

http://thefactoryfiv...r-Hazard-Lights
and

http://www.ffcars.co...tml#post1673120

Edited by dklawson, 26 January 2014 - 05:13 PM.

[KernowCooper]

Ok I've taken a look at the diagram, thats like the old Lucas kit where you only had Indicators and bought the add on Hazard Light Kit, included in the kit was a switch made which did not have a common connection on the 2 wires out to left/right indicators, otherwise when you switched the left indicator on it would also bring on the right.

 

For it to work the switch controlling the harard lights has to have no continunity on the 2 switch terminals marked below when the hazards are off, or if you cant get such a switch anymore that the insertion of one way diodes in both the wires marked would also overcome the issue.

Attached Files

•  Toggle Hazard Circuit.gif   54.98K   9 downloads

Edited by KernowCooper, 26 January 2014 - 05:53 PM.

[dklawson]

Thanks Kernow.  I think one of the links I posted also mentioned using diodes.  I don't have hazards on my Mk1.  Sometimes I think it would be nice to add them.

[KernowCooper]

Can be done quite easy Doug as you already posted the info, just a matter of finding the right switch or diodes, I can remember the old Lucas Kit was just a switch hazard relay and wires. Something you can make up as a project  in a morning

[KernowCooper]

And you can use a switch like this http://uk.farnell.co...4pdt/dp/1082323

[Ethel]

Using a modern electronic flasher unit will make it easier. It will flash at a constant speed regardless of load so you can leave the indicator circuit attached. A dpst could be used fed straight off the flasher to both poles. Sticking an ignition controlled relay between the flasher and indicator stalk would cut the indicators when you take the key out.

[giacomo]

thankyou for all the help guys, really appreciate it :) hopefully i'll have it sorted this weekend now! i've removed the hazard switch and messed around with the wiring and i now have indicators

 

thanks again for the help people