Right from turn signal doesn't work - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 06-06-2013, 06:28 PM Thread Starter
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Right from turn signal doesn't work

I have an 08 ford and the right front turn signal is not working. I have wiring on the truck for a boss plow if that matters. I figured it was a quick easy bulb change, I did so and noticed that the old bulb didn't look blown, replaced anyway. Turn signal still doesn't work, when I unlock the truck, that bulb lights up no problem, when I hit lock, that bulb does not flash as the drivers side bulb does. In looking at the manual, there doesn't appear to be a fuse or relay that operates passenger side turn signal only, rear works fine. Am I missing something here or can someone point me in the right direction?

Thank you

08 350
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post #2 of 4 Old 06-06-2013, 09:23 PM
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One of my backup light is really touchy. If the lamp isn't sitting in the socket exactly right it won't work, so I have to be careful when I change that one. Your turn signal might have a bad socket like my backup light does.

Check it with a meter and see if the contacts are getting power. If not, you can trace it back from there.
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post #3 of 4 Old 06-08-2013, 06:43 AM
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There's a TSB for plow wiring being installed on trucks with/without plow prep package.

The SJB sees the additional load on the circuit from the added bulb and kills the circuit because it thinks there's an issue with the circuit, kind of a self-preservation thing.

There is an update for the SJB that will fix this issue, the build range is trucks built BEFORE 04/18/2007.

It was typically to address headlamp functionality, but I have seen it fix signal/marker light issues also.

Hope this helps.

All else fails, scan the SJB for codes first.

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2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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post #4 of 4 Old 06-08-2013, 07:00 PM Thread Starter
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The parking light still works, the same bulb is the turn signal from what it looks like to me, which does not work. The smart junction box has been replaced as I lost headlights at one time for a similar reason to what you are stating. Oddly enough, that didn't fix the problem either. Ended up being a corroded plug. Headlights have been fine since other than a sensitive plug.

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