Tatey
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| posted on 23/2/15 at 10:03 PM |
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Sierra Indicator/Hazard Switch Wiring
Evening all,
I am currently trying to solve an electrical issue on my Haynes prior to IVA in April.
So I have the following indictor setup:
LED Rear Lights
LED Repeaters
Standard Bulb Front Indicators
I have Sierra switch gear and a Premier Wiring loom with a 3 pin indicator/hazard relay setup, I am using the following electronic flasher relay (180W
max) from CBS:
http://www.carbuildersolutions.com/uk/3-pin-electronic-flasher-relay
So as it stands I have wired my relay in the following way:
X = +12V
L = Indicator Switch
P = Dash warning light
I get the following behaviour:
Indicators won't work at all when using the indicator switch
The rear indicators and repeaters (repeaters are wired in parallel with rear indicators) will flash when the front indicators aren't plugged in,
hazard light will also flash, lights seem pretty dim however.
When front indicators are connected no lights will work except for the hazard warning light which is very bright but doesn't flash.
I was getting 8V to the front indicators when the hazards are plugged in, I haven't checked what happens when the indicators switch is on.
I have followed planetesters post in this thread and everything seems to be wired correctly on the switch side of things:
http://www.locostbuilders.co.uk/viewthread.php?tid=43404
I have dismantled my Sierra switch and cleaned all of the contacts with no luck. However I can't figure out what the long copper contact does
that protrudes out of part of the switch casing and into the back of the indicator stalk as there is nothing in there for it to connect to.
I originally bought an LED flasher relay from China but I thought it might be broken as it wouldn't flash when the hazard switch was on, it
would just light the rear lights up which is why I then bought the CBS one so I don't think it's relay related fault unless I've
wired it wrong?
Any help would be much appreciated. I also have a multimeter so any checks I can do to get to the bottom of it please let me know.
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L5W
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| posted on 23/2/15 at 10:42 PM |
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Hi,
Mine has pretty much the same set up, premier loom, electronic flasher relay, sierra switches but with LEDs all round. I had a similar fault whereby
the LEDs would flash between very bright and what seemed like 'half bright' instead of being completely off. I'm not sure about the
indicator switch not working but with the fronts disconnected, try removing the telltale bulb from the hazard swtich too and see if this makes the
LEDs start to work properly. It took me a while to find and I ended up changing the standard telltale bulb in the hazard switch to an LED bulb and
with a bit of re-wiring, managed to get everything working.
I short write up of my re-wiring job here
Also, I didn't need to use resistors but have heard these are needed for LEDs when using standard bulbs elsewhere on the car
cheers,
Lee
http://l5w-mk-indy-zetec.blogspot.com/
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CosKev3
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| posted on 24/2/15 at 07:52 AM |
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I'm sure when I wired my flasher in one of the terminals goes to earth, I've got Sierra switch gear with a mix of normal and led bulbs
with an adjustable flasher relay and everthing works spot on without removing bulbs from the hazard switch or using resistors 
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SteveWallace
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| posted on 24/2/15 at 08:50 AM |
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This is how I wired my premier loom and Sierra switches up. The repeaters (small bulb symbols) are LEDs but the front and rear indicators are normal
bulbs so I managed to get away with a normal relay due to the resistance through the bulbs
 
indicator wiring
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Tatey
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| posted on 25/2/15 at 09:37 PM |
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Well 19 blown 15A fuses later and I have finally solved my wiring problem! 
It turns out I'm a numpty and really should have fully understood my relay wiring before playing around with connectors.
I was essentially feeding a 12V supply into my relays tell tale bulb output and grounding the indicator switch through the relay.
With my new wiring arrangement both relays now work!
With the CBS relay I have it setup in the following way:
P - Nothing connected
X - 12V supply from indicator Switch (Pin 49 on indicator switch)
L - Output from flasher relay to indicator switch (Pin 49a on indicator switch)
Earth cable on premier loom left free
With my ebay special LED relay I have it setup in the following way:
B(+) = 12V supply from indicator Switch (Pin 49 on indicator switch)
E(-) = Earth cable on premier loom
L = Output from flasher relay to indicator switch (Pin 49a on indicator switch)
And now everything works as it should, indicators only come on with ignition and hazards work at all times including the hazard tell tale. Indicator
lights now flash on my Acewell dash and my front indicators work, my rears are also a lot brighter.
I haven't had to do anything with the hazard tell tale bulb, and the lights all flash at the correct rate.
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CosKev3
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| posted on 25/2/15 at 11:54 PM |
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Nice result
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