Norfolkluegojnr
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| posted on 13/4/16 at 06:02 PM |
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Argh help! Hazard issues
So my hazards don't work.
First of all, indicators work fine. I've changed the switch and the relay to no avail.
When the switch is on it just buzzes, then eventually stops. I've checked the power to the switch which is fine. Earth seems ok too. Checked
Earth on the relay, seems fine.
Nothing else obviously amiss. It's the only thing needed for MOT and I'm totally stuck.
Any ideas?
Edit: to add I'm using escort mk2 loom, so single flasher unit for indicators and hazards.
[Edited on 13/4/16 by Norfolkluegojnr]
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gremlin1234
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| posted on 13/4/16 at 06:57 PM |
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two questions,
have they ever worked?
and
are you using led bulbs?
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Norfolkluegojnr
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| posted on 13/4/16 at 07:17 PM |
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Yes they have worked I believe, certainly passed mot before.
No, just normal bulbs.
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loggyboy
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| posted on 13/4/16 at 07:26 PM |
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Are there separate relays for normal indicators and hazards?
All earths and connectors clean?
Mistral Motorsport
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Norfolkluegojnr
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| posted on 13/4/16 at 07:29 PM |
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It only has one relay. Works hazards and indicators.
I've chased the wiring and can't find anything obviously wrong. It's driving me nuts!
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Dusty
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| posted on 13/4/16 at 08:49 PM |
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There are two power supplies for driving the relay. 'Ignition on' supply for indicators. 'Battery+' for hazards. Sounds like
you have a supply problem for the bat+. Trace it from fuse to hazard switch and check the hazard switch contacts too.
[Edited on 13/4/16 by Dusty]
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snowy2
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| posted on 14/4/16 at 06:45 AM |
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hazard switches are often the problem, next the relays.......
sometimes you are the pigeon, most of the time the statue.
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Norfolkluegojnr
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| posted on 14/4/16 at 06:52 AM |
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Switch has been replaced, as has relay. Good 12.4v at relay, earth seems fine too.
Could it be the indicator stalk?
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theprisioner
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| posted on 14/4/16 at 09:12 AM |
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There are two types of hazard relays the dual type (does hazards and indicators): as the man above says needs a dual supply switched as well as fixed
12v. And the dual relay configuration. CBS catalogue does a very good description of both ccts. My money would be on the hazard switch if you have the
correct relay fitted.
http://sylvabuild.blogspot.com/
http://austin7special.blogspot.co.uk/
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Norfolkluegojnr
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| posted on 14/4/16 at 09:43 AM |
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Thanks for the input - switch replaced, relay replaced. Both items are direct replacements with matching part numbers.
As the feed wire runs through the indicator arm, is it possible this messing with the signal? indicators work, but its the last thing I can think of.
I'm 99% sure all wiring is fine from switch and relay.
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theprisioner
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| posted on 14/4/16 at 09:55 AM |
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These hazard ccts sort of tell you what is wrong. When in hadard mode the indicator switch should have no effect. In either mode the number of bulbs
drawing current dictate the flash rate. If in normal mode then if you remove a bulb it should flash faster. In hazard mode the same applies. The
hazard (dual relay) has two mode the high current mode and the low current mode dictated by the load. If in hazard mode you lose a bulb it may revert
to low current mode or somewhere in between I guess.
http://sylvabuild.blogspot.com/
http://austin7special.blogspot.co.uk/
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Norfolkluegojnr
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| posted on 14/4/16 at 10:09 AM |
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quote:
Originally posted by theprisioner
These hazard ccts sort of tell you what is wrong. When in hadard mode the indicator switch should have no effect. In either mode the number of bulbs
drawing current dictate the flash rate. If in normal mode then if you remove a bulb it should flash faster. In hazard mode the same applies. The
hazard (dual relay) has two mode the high current mode and the low current mode dictated by the load. If in hazard mode you lose a bulb it may revert
to low current mode or somewhere in between I guess.
Hazard has no effect when indicators are on, and vice versa.
so are you suggesting to try pulling a bulb out to see what happens?
Does the circuit earth anywhere other than at the relay?
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theprisioner
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| posted on 14/4/16 at 02:32 PM |
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Well I assume that 4 bulbs illuminate in flash mode and only two in indicator mode. Yes remove a bulb and see what happens. It should go faster. in
either mode.
http://sylvabuild.blogspot.com/
http://austin7special.blogspot.co.uk/
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Norfolkluegojnr
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| posted on 14/4/16 at 02:37 PM |
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quote:
Originally posted by theprisioner
Well I assume that 4 bulbs illuminate in flash mode and only two in indicator mode. Yes remove a bulb and see what happens. It should go faster. in
either mode.
I'll give it a try and report back.
Currently, nothing happens (other than a bit of buzzing) when hazard mode is engaged. it feels like an earth issue, but i've checked that and it
seems to be earthing fine.
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theprisioner
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| posted on 14/4/16 at 03:35 PM |
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Idea
Stage 1: Take two bulbs 21W each connect them in parallel with the flasher unit in series (no other car wiring at all) then connect the whole lot
across a 12V battery. If it does not flash then the flasher is effective otherwise you have a simple wiring fault.
Stage 2: remove the flasher switch the indicators should work without it provided you link the flasher to the wiper part of the indicator switch. Then
the only thing left is the hazard switch.
http://sylvabuild.blogspot.com/
http://austin7special.blogspot.co.uk/
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snowy2
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| posted on 16/4/16 at 07:30 AM |
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This the wiring for a conventional hazard switch (they have 8 pins but with two blanked off....generally)
[img] [/img]
[Edited on 16/4/16 by snowy2]
sometimes you are the pigeon, most of the time the statue.
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