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I got a Merc 3340 the turn signals for trailers only are not working

I checked fuses and all are fine

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Check wires in the trailer connections

Posted on Dec 15, 2014

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1 Answer

2004 silverado factory wired trailer package, worked fine, recently right turn signal stopped working.12 volts always on the pin for right signal pull fuse at fuse block and voltage drops off.


it would be normal for the voltage reading to stop when the fuse is pulled as that is breaking the circuit
check the wiring and grounds in the trailer harness
there is a light control module but that would be the problem if the vehicle lights work with no trailer connection

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2009 Silverado 4x4 pickup with towing package and factory installed Trailer Brake controler installed at factory. The system has worked in past. I had my Stock trailer rewired and things tested out fine...


It sounds like you lost a ground.
check traier hookup first.
Probably not the controller.
P.S. There are multiple fuses for this setup. check all ! ! !

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If it is a factory trailer package then there are fuses for the left turn signal and the right turn signal for the trailer connector. Check your owners manual for the location of these two fuses.

Bob

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I have the exact same issue. I have also tested my trailer on other vehicles and it works fine. I even purchased a light up tester and found the problem at the harness. It seems like a bad ground to me but I can't seem to find one.

The trailer lights have a common brake/turn wire while the truck has seperate turn and brake lights. I think the problem lies with the device that marries the two for the trailer wiring but I don't know where to find it?

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Sounds like the flasher unit to me. Normally the emergency flasher and turn signal are separate.

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R.h trailer plug has no out put? checked all fuses, all the signals on the truck are fine? just the trailer plug


Take the plug apart (small set screw on the side) and make sure one of the wires hasn't popped out. Take out the screw and slide off the cover to see.
You will need a mini screwdriver to re-tighten the brass terminal if its the case.
Have you tested this with a test lite?
Good luck.....

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1 Answer

Pass. side trailer turn and brake lights out 1999 ford explorer


if your vehicle lights are working all the fuses will be good. follow the cable from the towing socket on your vehicle , it will most likely go behind one of the rear lights to connect into your cars system,
check your tester where the cables join and you should find the problem. hope this helps.

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1998 navigator trailer harness


try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help. You can take a 12 volt test light and check your fuses also. Touch each side of the fuse on the metal part that is exposed. Use your emergency flashers to do this. The turn signal/brake light fuse will only power when it is in use. Check owners manual as there are probably seperate fuses for the trailer and the vehicle. There is probably a connector under the vehicle near the back... usually above the spare tire that can come loose, but not likely unless it is broken. Hope this helps, Mike

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Turn signal issue


Have you checked the fuse inside the car ? If it does not turn on, take the car to an autoparts store to have it scanned for a code. then we can go fom there.

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2004 F250 No brakelights/turn lights on trailer


You will need to get a 12 volt test light and check the trailer connector for a voltage signal to the trailer, it may also have seperate fuses under the hood for the trailer lights if the system is factory installed, federal law requires the 2 systems be isolated, if there are blown fuses find the short in the trailer before replacing fuse(s), with no exceptions the short is always in the trailer. Hint, check the fuses 1st.

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