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The most likely cause for the turn signals not to work when the running lights are on with your trailer is a bad or weak ground. If all the ground connections look good, you should also make sure the current rating of your vehicle wiring harness is sufficient to handle the trailer lights.
Why do my turn signals not work when my headlights are on?
This is a classic bad ground problem. The reason the turn signals quit working when the lights are on, is that a 12-volt signal is now being sent down the opposite wire, which was acting as a ground before. Once the lights are turned off, everything will work fine again.
Why won’t my turn signals work on my trailer?
If it is not working at the connector, there might be a fuse blown or missing in the power distribution box under the hood. Also, make sure both connectors are clean, and free of any dirt or corrosion. This very well could be a ground problem. If so, correcting the bad ground or broken wire could solve the problem.
Why does my left turn signal not work on my trailer?
The left side turn signal and brake light is generally the yellow wire going into your trailer connector. The first thing to do is check the fuses on your tow vehicle. If the problem is there then you need to clean it, if necessary, and if that doesn’t fix it the problem is in your vehicle.
Is there a fuse for trailer turn signals?
If you’re problem was turn signals then simply look for the trailer RT or LT fuse and simply replace if needed. This will solve the problem of brake lights also, as they are the same fuse.
Why do my trailer lights stop working when I turn on my headlights?
If the ground wire to the trailer frame or the tail light grounds are not connected securely to clean, rust and paint free surfaces then when the headlights are turned the extra amperage draw for the running lights will cause all sorts of lighting issues. Jul 6, 2015.
Where is the turn signal fuse located?
This small, cylindrical device is sometimes located in the fuse panel under the dashboard of the car. It costs about $3 in the auto parts store and works reliably for years.
How do you find a short in wiring on a trailer?
Check all the connections making sure they are plugged in. Most likely you will find a unplugged one. If all look good then unplug them all and try again. If the fuse does not blow you have a light some how gounding out if the fuse still blows with all the lights unhoooked you have a bare wire rubbing somewhere.
Why is only one side of my trailer lights working?
Poor ground connections are the most common culprit of trailer wiring issues. The lights will have either a ground wire or they will ground through the mounting hardware. With the trailer connected to the tow vehicle, use your circuit tester to test the left side stop/turn and running light circuits.
Where are the fuses for trailer lights?
The fuses that control the trailer lights are in slot Nos. 14, 15, 16 and 17. Pull each fuse out, using the puller, and inspect the metal strip within the plastic casing. If it is burnt or broken, install a new fuse with an identical amperage rating.
What is the fuse called for trailer running lights?
Troubleshooting Trailer Running Lights Not Working with 2017 Ram 2500 The trailer running light fuse according to your owners manual is F29 and is a 20 amp blue fuse. You will also want to check the trailer tow receptacle fuse F30 which is a 30 amp pink fuse.
Do turn signals have separate fuses?
Turn signals only work when the ignition is on; hazard lights work whether the ignition is on or not. The two systems have separate power supplies, so they have separate fuses. You may have a blown fuse. Hazard lights and turn signals use the same bulb, so it is not the bulb, the lamp, or the cables to them.
Do taillights have separate fuses?
On newer cars, the tail lamps can be fused separately and/or each bulb or shared circuit can be fused. On most new cars, the fuse would have to be removed to be checked due to the arrangement of the fuses. If the piece of metal inside the taillight fuse is intact, the fuse is still good.
How do you ground a trailer light?
Each lamp needs to be grounded either through its mounting studs being in direct contact with the trailer frame or by having a jumper wire ran from the lamp to the trailer frame. Ground the trailer connector at the front of the trailer, which will use the trailer frame as a ground wire.
Why do my trailer lights turn off when I brake?
It sounds like you have a ground issue. When trailer lighting does not have a sufficient ground many different scenarios can show up, but the most prevalent is when the most amperage is applied, like tail lights on and brake pedal pressed, the lights go out. All lights must be properly grounded for proper function.
How do I know if my turn signal relay is bad?
The most common symptom of a bad or failing turn signal / hazard flasher is hazards or turn signal lights that do not function. If the flasher breaks or has any internal issues it can cause the lights to malfunction, or not respond at all when the turn signal lever or hazard light button are pressed.
How do you know if you have a short circuit?
A short circuit occurs when an accidental connection is created when a wire carrying current comes in contact with a neutral wire or the ground in a circuit. If you notice fuses being repeatedly blown or that a circuit breaker trips frequently, it could be a sign of a short circuit.
