Passenger tail lights and turn signal wont cut off. - Ford Mustang Forum
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post #1 of 9 (permalink) Old 01-16-2017 Thread Starter
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Passenger tail lights and turn signal wont cut off.

Hey everyone, so I woke up this morning to see the right 2 tail lights and turn signal on my car were on, and wont turn off. I checked my passenger side floor to see if it was wet, (it wasnt) and right now im troubleshooting it making sure everything else works. Gonna check the SJB in a few mins to see if its damp or not. Please let me know what you think and how i can correct this.

(I already removed the grommets from a previous water leak incident.)

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post #2 of 9 (permalink) Old 01-16-2017 Thread Starter
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Quick update, found about 5 drops of water on it, gonna dry it out and clean it and hope for the best, hopefully this fixes it

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post #3 of 9 (permalink) Old 01-16-2017
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If not then look for a bad ground wire or connection in the tail light harness.

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post #4 of 9 (permalink) Old 01-16-2017 Thread Starter
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Luckily cleaning the connector pins of the corrosion did the trick.
Thank you big gear head for your idea, i really do appreciate it!

Now time to figure out a permanent solution on how to not get water on that darn sjb
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post #5 of 9 (permalink) Old 01-17-2017
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Could you wrap it in electrical tape?

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post #6 of 9 (permalink) Old 01-17-2017
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I had a sheet of dynomat laying around, I trimmed a piece big enough to cover the thru the body grommet that is above the SJB. had to cut a slit in it to get it around the harness that comes thru. so far it has worked but I don't drive my Mustang in the rain if I can help it. good luck
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post #7 of 9 (permalink) Old 01-18-2017
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I have the same problem after changing the bulb i going to replace the harness which i hope it is just the harness if its not then i have to check the wiring because its a bad ground its shorting out.

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post #8 of 9 (permalink) Old 01-18-2017
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more than likely the wiring is just fine. almost everything in the car is hot and the SJB is the ground, I.E. there is power going to all the lights but the SJB grounds the connections depending on signals to it. even if your passenger floor area isn't wet, take some time and remove the kickpanel, and check the connectors. if need be, remove the negative battery terminal, then unbolt the SJB from the car (1 10mm bolt) unplug connectors and visually inspect. take it apart if need be. there are threads on here to help guide you thru the process. good luck
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post #9 of 9 (permalink) Old 01-18-2017
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Not sure here which grommets the OP is talking about. Maybe he's talking cowl drain grommets ? If those get plugged, water enters the cabin air filter area of firewall.

Everything below relates to water entering COWL CHANNEL (as shown in tech illustrations). We want to make sure no water enters this area....and into cabin of car from this area.

I'm talking here about 1st, cowl grommets base of windshield. Those should be checked...if they leak, can be resealed, outer edges with urethane sealer. You do not have to replace them as Ford states to do, as they cost over $5. each and there are 5 on each side of cowl, ten total. Once we're sure they are not leaking, next to check:

If not the grommets in cowl, it's often, 2nd, the 'FORWARD PINCH WELD' area which needs to be resealed with urethane sealer...both horizontal (across cowl lip) and vertical areas (just below hood hinge) passenger side of car. Your intent here is to keep water out of the 'COWL CHANNEL'.
Best to remove passenger side black plastic 'COWL PANEL GRILLE' to easily access this area of cowl.

Urethane Sealer from Home Improvement store is cheap and works fine...about $5. a tube plus a cheap caulking gun.
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File Type: pdf water leak newest with picture.pdf (282.3 KB, 40 views)
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