Fitting hazard lights kit

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MollyOwner
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Fitting hazard lights kit

Postby MollyOwner » Thu May 21, 2020 4:58 pm

I’m confused!
I’ve read two different views here regarding a 4 or 6 lead hazard flasher kit. Some folks infer that using 4 leads and the existing flasher unit can causes problems, whilst others say that you must have a six lead with secondary separate faster flasher unit.
The 4 lead is cheaper of course and I hope very much never to have to use the hazard lights!
Has anyone fitted a 4 lead kit from eBay?
Stay safe guys.
Cheers.
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geoberni
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Re: Fitting hazard lights kit

Postby geoberni » Fri May 22, 2020 10:35 am

Hi
I'm a little confused by your description of the '4 and 6 wire' types, because as I understand it, the 4 wire still has a separate flasher, it's just that it only has 2 outputs, one to each side, whereas the 6 wire will give 4 independent connections to each indicator.
I've never seen any after-market Hazard Flasher system that uses the existing flasher Unit......

You need a separate flasher unit because it is now dealing with twice the current, i.e. 4 lamps instead of 2.
I'm at a bit of a loss to understand how any (after-market) system using the existing Flasher Unit could cope with double the wattage. :-?
The designers of the factory fit would have specified the rating they needed for what they designed.

I have a 6 wire on Basil, simply because I had one in the shed dating back to the late 70's and never used.
It was convenient too as Basil has the DB10 Relay style of indicator arrangement.

Just edited to add that as regards your Question
Has anyone fitted a 4 lead kit from eBay?
The only 4 wire I can find there at the moment is this one, with a flasher included.....
https://www.ebay.co.uk/itm/Hazard-Flash ... SwzcleuUfz
Last edited by geoberni on Fri May 22, 2020 12:19 pm, edited 1 time in total.
Basil the 1955 series II

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panky
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Re: Fitting hazard lights kit

Postby panky » Fri May 22, 2020 12:15 pm

I fitted these to my Commer campers, so far no problem but only used them to test. I've heard that you can blow the unit if you leave the indicators on at the same time but I tried it with no undue effects, wouldn't make a habit of it though.

https://www.ebay.co.uk/itm/HAZARD-WARNI ... 2749.l2649

The only drawback is the modern looking switch but it can be discretely hidden
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jaekl
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Re: Fitting hazard lights kit

Postby jaekl » Fri May 22, 2020 12:42 pm

Do they have a feature to prevent the ignition being powered when the lights flasher? The power can back feed from the lights to the ignition. A diode in the ignition circuit would stop it.

panky
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Re: Fitting hazard lights kit

Postby panky » Fri May 22, 2020 2:32 pm

Would that mean you could start the engine with flashers running and ignition off?
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jaekl
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Re: Fitting hazard lights kit

Postby jaekl » Fri May 22, 2020 2:50 pm

Yes, when the four way flasher sends power to the lights it also powers up the ignition by going through the fuse the other way. The engine will run, shut down, and then run again with each flash. If you move the turn signal circuit to the other fuse or a new fuse, it'll solve one problem but you'll need to remember to make sure the turn signals are off when you leave the car. A diode on the unfused side of the fuse would be another solution.

jaekl
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Re: Fitting hazard lights kit

Postby jaekl » Fri May 22, 2020 2:56 pm

Also there can be a problem with the brake lights if your Minor uses the same lamp filament for the brake lights and the turn signals. You'll also have to move the brake circuit over to the non-ignition fuse. This would not apply to the home market or later Minors.

geoberni
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Re: Fitting hazard lights kit

Postby geoberni » Fri May 22, 2020 3:41 pm

panky wrote:
Fri May 22, 2020 12:15 pm
I fitted these to my Commer campers, so far no problem but only used them to test. I've heard that you can blow the unit if you leave the indicators on at the same time but I tried it with no undue effects, wouldn't make a habit of it though.

https://www.ebay.co.uk/itm/HAZARD-WARNI ... 2749.l2649

The only drawback is the modern looking switch but it can be discretely hidden
Looking at the image, it's hard to tell, but I take it that's a '4 wire' ?

MollyOwner wrote:
Thu May 21, 2020 4:58 pm
I just spotted this, might be worth bidding if a:
https://www.ebay.co.uk/itm/Lucas-Origin ... SwyppewpF5
Basil the 1955 series II

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simmitc
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Re: Fitting hazard lights kit

Postby simmitc » Fri May 22, 2020 3:45 pm

The older, better quality hazard kits had a multi-pole switch that disconnected the indicator feed when the hazards were on. This ensured that power could not flow back into the other circuits. Looking at the current offerings, I have not been able to find any detailed specification to confirm how they work. Presumably cheapness is no more important than function. :-?

Just spotted this. It seems to have the dedicated flasher unit and the multi-pole switch. https://www.scparts.co.uk/sc_en/hazard- ... gJ6CvD_BwE The are downloadable fitting instructions.

jaekl
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Re: Fitting hazard lights kit

Postby jaekl » Fri May 22, 2020 4:02 pm

My experience was with aftermarket units from the Sixties. Advances must have been made. I suspect the existing wire is cut rather than just tapped. The hazard switch is "inserted" into the wires to the indicators with normal operations simply passing through the switch. Once activated the normal circuit is opened and the power source is switched over to flashing power.

geoberni
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Re: Fitting hazard lights kit

Postby geoberni » Fri May 22, 2020 4:18 pm

simmitc wrote:
Fri May 22, 2020 3:45 pm
The older, better quality hazard kits had a multi-pole switch that disconnected the indicator feed when the hazards were on. This ensured that power could not flow back into the other circuits. Looking at the current offerings, I have not been able to find any detailed specification to confirm how they work. Presumably cheapness is no more important than function. :-?

Just spotted this. It seems to have the dedicated flasher unit and the multi-pole switch. https://www.scparts.co.uk/sc_en/hazard- ... gJ6CvD_BwE The are downloadable fitting instructions.
What you found looks very similar to this one: https://www.ebay.co.uk/itm/HAZARD-WARNI ... 4902.l9144
:wink:
Basil the 1955 series II

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MollyOwner
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Re: Fitting hazard lights kit

Postby MollyOwner » Sat May 23, 2020 2:02 pm

Thanks all. I now realise I was confused re the number of leads. Have now ordered the suggested one from eBay and look forward to fitting the kit - but hopefully not having to use them!
Stay safe
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Chappers
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Re: Fitting hazard lights kit

Postby Chappers » Mon May 25, 2020 7:30 pm

I’m sorry, but I wouldn’t use one of those.
I bought one but the damn thing fell apart and was poorly made and quite useless, I couldn’t send it back as I had cut the cover slightly to fit.
Tried another modern type Switch but also no good.
I found the only reliable way was to fit a separate flasher unit for the hazards only.
I used this switch https://www.autoelectricsupplies.co.uk/ ... ategory/43
And the connector advertised on the same website and two of their solid state flasher units.
I found it best to keep the indicator flasher connections separate from the hazard flasher.
Trying to run the switch through one flasher unit caused all sorts of issues, using separate flasher relays solved this.
The switch really works great, and much sturdier than those horrible Lucas copies.
Hope this helps, I spent 3 or 4 weeks trying sort my car out. Now I have a reliable and robust flasher and hazard system.

dp
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Re: Fitting hazard lights kit

Postby dp » Tue May 26, 2020 8:57 pm

simmitc wrote:
Fri May 22, 2020 3:45 pm
The older, better quality hazard kits had a multi-pole switch that disconnected the indicator feed when the hazards were on. This ensured that power could not flow back into the other circuits. Looking at the current offerings, I have not been able to find any detailed specification to confirm how they work. Presumably cheapness is no more important than function. :-?

Just spotted this. It seems to have the dedicated flasher unit and the multi-pole switch. https://www.scparts.co.uk/sc_en/hazard- ... gJ6CvD_BwE The are downloadable fitting instructions.
Similar or the same here but considerably cheaper used one in my Minor and recently bought one for my current project:

https://www.carbuilder.com/uk/push-pull ... -kit-black
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mowogg
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Re: Fitting hazard lights kit

Postby mowogg » Wed May 27, 2020 2:25 pm

There is a dedicated smiths kit available from the usual suppliers -this is really easy to fit, with the cables all colour coded the same as the car. It has a period style light up switch too.

Not sure saving a few pennies here makes sense?


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