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Old Oct 24, 2013 | 09:12 AM
  #1  
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Left Front Turn Signal Problem

'03 SCrew, 5.4, auto, 4x4
Yesterday my left turn signal started flashing fast; checked and the front was not flashing. Picked up a new bulb, changed it, didn't fix anything.

I've tried:
-tilt wheel up/down in all settings-no change
-checked the wiring at the top of the column; still good and solid (thanks to information I received here before).
-swapped the bulbs left to right and vice versa-no change.
-swapped the sockets left to right and vice versa-no change.

Other info:
-the left front is the only one not flashing with hazards on.
-all original equipment, except I removed the stock side mirrors (w/signal) and installed manual trailer towing mirrors, but that was 2 or 3 years ago.
-the dash indicator light for left turn (arrow) does not come on at all.
-last trailer tow was over a month ago and all was good.

I ran out of daylight last night and at work now so I would like to get some help as to which Fuse, Flasher, Relay, etc., I should check/replace and where to find them on the truck; under the hood (1st or 2nd stack of the fuse blocks); under the dash above the pedals; steering column???

Thanks in advance,
Brent
 
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Old Oct 24, 2013 | 02:10 PM
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Could it be the Master Function Switch, with just this 1 isolated problem?
 
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Old Oct 24, 2013 | 06:12 PM
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I am leaning toward it being a problem in the column, either the wiring or the multi-function switch itself. Why I say that is the dash light not working. It uses the same circuit coming out of the turnsignal switch as the front turn lights. So since they both don't work, we know the problem is up near the column.

One thing you could do is find the proper wire coming out of the turnsignal switch(the multi-function switch) set the hazards on or the set the lever to the left, and take a testlight and poke the correct wire and see if the testlight blinks. If it doesn't that pretty much points to the switch itself.
 
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Old Oct 25, 2013 | 10:04 AM
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Thanks Dave, I will see if I can do that test. Do you, or anyone else, know the part number of the multi-function switch? I am not opposed to buying one, just don't want to pay dealer labour unless I really have to.

Brent
 
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Old Oct 25, 2013 | 01:16 PM
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I called my dealer to get a quote and got the service part number (YL3Z13K359ABA) from them as well. At half the cost, I have ordered one online.

I will update here how it goes and if it was the fix.
Thanks again,
Brent
 
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Old Oct 26, 2013 | 08:20 PM
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A cheap 2 dollar test light can tell you if the MFS output is working to that lamp. A lot cheaper than a MFS and still not fixed. Hope it works out for you.
 
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