Mud UK Carling Hazard Switch Question - Defender Source
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  #1  
Old August 14th, 2013, 04:52 PM
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Mud UK Carling Hazard Switch Question

So, I had not issue with the instructions from Mud (wire colors on my truck matched up to the colors in the instructions), got everything wired up and tested.... both blinkers work but when I flip the switch to on, however it does not light up and the hazards do not come on (not sure if it is an interconnected problem, but I've noticed my horn and flash high beams also aren't working). Recheck all of the wiring and everything is tight and where it should be. Any suggestions?

I've attached the wiring instructions and the switch pin layout that I used from Mud's site.

Any and all help is greatly appreciated as always!
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  #2  
Old August 16th, 2013, 08:32 AM
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Experimented again this morning with moving wires around and it seems as though everything is correct. It is strange though that when the switch is in on the on position as currently wired per the Mud instructions, it turns off the turn signals.
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  #3  
Old August 16th, 2013, 09:12 AM
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I struggled with this a while ago and did a write-up. Glad you got it working!

BTW, the hazard switch should not turn off the turn signals? I'm sure I am misunderstanding you

http://www.defendersource.com/forum/...hazard+carling
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  #4  
Old August 16th, 2013, 09:15 AM
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Jamie Austin
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Quote:
but I've noticed my horn and flash high beams also aren't working
This will explain a lot.... the hazard, horn and flash high beam, are all fed pre-ignition switch, so they all work with no keys in the car....

Obviously the hazards should work with no keys in the car, so i'd check the fuse to these three items.
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  #5  
Old August 16th, 2013, 09:46 AM
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Ed, it's actually still not working properly. And believe it or not, when I removed the oem hazard switch, it did kill the turn signals. They only started working again once I had hooked up the Mud hazard switch.

I thought I had checked all of the fuses, but I will got back again more thoroughly. Very helpful, thanks Jamie.
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  #6  
Old August 16th, 2013, 10:24 AM
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Quote:
Originally Posted by blaughva View Post
Ed, it's actually still not working properly. And believe it or not, when I removed the oem hazard switch, it did kill the turn signals. They only started working again once I had hooked up the Mud hazard switch.
Ahh, gotcha. When you said, "everything looks correct" I thought you meant it had been fixed.

If Jim's suggestion on fuses doesn't pan out, take a look at the wiring diagram in my post.

The blinkers will not work without the hazard switch, because the hazard switch provides power to the blinkers.
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  #7  
Old August 16th, 2013, 10:29 AM
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Thanks. Hopefully I just missed the blown fuse. I really don't want to play the "let's try every combination" game.
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  #8  
Old August 16th, 2013, 10:38 AM
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Bradford, one other thought:

If your blinkers work, but the hazard light does not work, then check for +12V HOT attached to pin 3. If you do not have +12V HOT on pin 3, then you will have no power to the blinkers when the hazard switch is turned on.
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  #9  
Old August 16th, 2013, 10:50 AM
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Great info, thanks Ed. Hopefully I can report back later that I'm up and running.

Just noticed you are in DC. We should meet up sometime.
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  #10  
Old August 16th, 2013, 10:54 AM
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Have you looked at the wiring diagram and tried to fault find? It is fairly clear on the diagram.
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  #11  
Old August 16th, 2013, 11:11 AM
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I will try and explain how it work.

In the off position, switched power is directed to the signal flasher relay through the hazard switch. The signal switch then controls sending power to either signal.

In the on position, the hazard switch directs unswitched power to the flasher relay and turns on both signals.

Check the purple wire (unswitched power) to see if there is 12V. The line is fused.
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  #12  
Old August 16th, 2013, 11:22 AM
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This is a NAS 110. Not sure if it the same as yours.
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  #13  
Old August 16th, 2013, 11:30 AM
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Thanks John, any ideas or suggestions at this point are great appreciated.
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  #14  
Old August 16th, 2013, 11:31 AM
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Check that all this is correct.
Purple - Unswitched power
Green - Switched power
Light Green - Power to relay.
Light Green / Brown - Power from relay.
Green/white - Right signal
Green/Red - Left signal
Black - Ground
Red/White - Instrument light


Also attached D90 diagram from 1993. One difference.
Black/Red - Power to hazard switch light
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  #15  
Old August 16th, 2013, 11:33 AM
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You need to figure out what each wire is connected to and that it is to the proper pin on the carling switch. The colour codes and wiring change through the years and may be different for NAS trucks.
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  #16  
Old August 17th, 2013, 12:33 PM
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Looks like it was just a blown fuse after all (not sure how I missed it the first time). Thanks for all the help guys!
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