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Rear Hazard Lights

Posted: Fri Apr 11, 2014 5:35 pm
by Mead
Hey Guys,
I've lost power to my rear hazards. I still have brake lights, markers and signals but no rear hazards although the fronts still flash.
I've done a bit of digging on here and read that it might just be the hazard switch itself. I just replaced the flasher relay last summer and all was working then and now suddenly the rears don't flash but the fronts still do. Anybody able to confirm this or had the same problem?

Thanks for any help in advance.

Re: Rear Hazard Lights

Posted: Fri Apr 11, 2014 11:09 pm
by BobbyD
Same here. Front side lights flash great but back lights do not. Kinda defeats the purpose... They used to flash. Consulted with experts (Jim and Scott) and was told to replace the actual switch. I am awaiting delivery. EI has them in stock.

Re: Rear Hazard Lights

Posted: Fri Apr 11, 2014 11:26 pm
by Jimm391730

Re: Rear Hazard Lights

Posted: Sun Apr 13, 2014 5:10 am
by Ian
I've just replaced my flasher unit with a Bosch one and had the exact same fault. No rear hazards. When I took the two bolts off that held the old flasher unit on, I didn't immediately notice that a wire with a ring terminal on the end is clamped in place and earthed by one of the bolts. Everything worked except the rear hazards. I spotted the wire hanging loose and earthed it and all good again. Maybe you have the same problem? The wire was on the forward side of that plate so not easy to see..

Re: Rear Hazard Lights

Posted: Wed Apr 16, 2014 6:57 pm
by Mead
Rear hazards are fixed! :D

Thanks everyone for your comments and suggestions. Here's what I found and how I fixed them.

Like Jim I wanted to see inside that hazard switch to see how it worked and why it might have stopped rather than just replace it and ask questions afterwards. After studying the wiring diagrams for a few days I was scratching my head wondering why I couldn't just jumper out the switch and get the rear lights to flash. So with the switch cover off and the power on I carefully started to trace the circuit through the switch when I realised that the small relay in the switch itself was not energizing nor was the lamp in the illuminated handle flashing. It was then that I realised that the face of the switch is also a ground in the circuit completing the relay circuit allowing the rear lights to flash.

Notice the corrosion on the face of the switch
Haz-Sw.jpg
Haz-Sw.jpg (26.68 KiB) Viewed 2967 times
Small relay in switch
Haz-Sw_2.jpg
Haz-Sw_2.jpg (25.85 KiB) Viewed 2967 times
Cleaned up ready for re-install
Haz-Sw_4.jpg
Haz-Sw_4.jpg (25.65 KiB) Viewed 2967 times
Next I cleaned up the face of the switch quickly on the wire wheel and re-installed and voila flashers that work front and rear.
Hope this helps someone else in the future.