No right turn signal

[Lancerdad34]

I have a 2003 Loadmaster that I have no right turn signal. Everything else lights is OK. I took off the plug cover and there are only 6 wires. I have attached pics of the plug and wires on the trailer. Thanks for any help.

Brian in MI

 

[GA_Boater]

Do you have a right brake light? LED or incandescent bulbs? Have you tried swapping bulbs left to right?

 

[Lancerdad34]

Thanks for the reply. I tried a new bulb and it is the same. The bulb on the left the blinker is the old style with two filaments.and on the right a small led type bulb. The running and brake lights work on the right side just no blinker.

 

[GA_Boater]

Get a tester to plug into the vehicle. The same wire from the connector powers the brake/signal filament or LEDs, so the vehicle needs to be tested.

Can you try another vehicle? What are you towing with?

 

[GA_Boater]

Another quick test - Swap the yellow and green wires at the connector and see if the left signal stops working and the right starts working.

 

[Lancerdad34]

I have a 2018 dodge ram 1500 with the tow package. I will give the wire swap a shot Thursday. Thanks!

 

[M2HB]

The brake light and the blinker is the same. If the brake light works, the blinker should work. If not, it has to be a problem with the vehicle. Within the trailer it is the same.

 

[hemi rt]

Have a look in the fuse box under the hood, you should find 2 fuses, one marked tlr rh turn and one marked tlr lh turn or something like that; the trailer turn signals have their own fuses separate from the vehicle fuses for the turn signals

 

[MTboatguy]

The brake light and the blinker is the same. If the brake light works, the blinker should work. If not, it has to be a problem with the vehicle. Within the trailer it is the same.

Nope, my Chevy has separate turn signal fuses. You can pop the turn signal fuse for the trailer wiring and still have brakes and turn signal on the truck.. Just did it again today.

 

[M2HB]

The trailer wiring for the right brake light and right turn signal IS the same wire.
Therefore, if the right turn signal on the trailer is not working when the right brake light does work, then the problem is probably with the vehicle.

 

[Maclin]

Lancerdad34 Is this trailer new to you since you got the Truck? Or have you towed it with another vehicle(s) before this Truck?

 

[MTboatguy]

The trailer wiring for the right brake light and right turn signal IS the same wire.
Therefore, if the right turn signal on the trailer is not working when the right brake light does work, then the problem is probably with the vehicle.

Towing packages on the newer trucks are wired differently. The new Chevs have a different wire for the turn signals and brake lights then for the taillights and brakes on the truck. There is a whole separate power center under the hood of my truck that is for the towing package. Apparently in some of the Dodge truck towing packages there is a couple of fuses that are not normally used on boat trailers and they cause a short that can affect lighting on your trailer, but they won't on the truck.

Take a look in your owner's manual it will show the location of the various trailer towing package fuses and relays.

Here is a link that shows the various power centers under the hood from the Dodge trucks, look at the last one listed and read down to the various fuses and what they are used for, you should have a similar diagram in your manual for your truck that shows the correct location for everything.

http://fusesdiagram.com/dodge/fuses-and-relay-dodge-ram-2009-2016.html

 

[M2HB]

There have been Toyota’s that have not used the typical brake and turn signal combination for years.

I’m not aware of trailer manufacturers wiring the trailers any different than they have for decades.

Is there anyone who has run across any trailer manufacturers who aren’t using standard wiring?

 

[GA_Boater]

There have been Toyota’s that have not used the typical brake and turn signal combination for years.

I’m not aware of trailer manufacturers wiring the trailers any different than they have for decades.

Is there anyone who has run across any trailer manufacturers who aren’t using standard wiring?

Converters take care of the tow vehicle sending brake, L-turn and R-turn volts on the green and yellow trailer connector.

Trailers haven't changed, tow vehicles have. Vehicle electrical systems are all digital CAN bus networks now, even simple things like brake lights and turn signals use network interfaces to light a light.

Thank heavens trailers are still dumb and we can tell you to fix the bad ground when lights don't work instead of plugging an analyzer onto the trailer to tell you to fix the ground. We're a heck of a lot cheaper, too.

 

[MTboatguy]

Has nothing to do with the trailers, they are still 4, 5, 6, 7 or 9 wire systems depending on what type of application they are used for, but they have changed how the electrical signal is sent to that trailer from the tow vehicle and like GA said, many of them are fully network capable to route that electrical signal to different areas for different functions.

Motor vehicles are no longer dumb terminals, they take an active roll in their management, I saw a brand new truck at my buddies yesterday and came from the factory with brake controller fully integrated in the dash that self adjusts something like a 1000 times a minute to adjust brake bias on the trailers electric brakes.

 

[M2HB]

Since trailer wiring hasn’t changed in decades then if the right trailer brake light works and the right trailer turn signal light doesn’t, it makes sense that the problem is with the TV or the interface between the two.
I doub’t if trailer manufacturers will change what they are doing in the near future.

There certainly are several different connectors, but the one that is the most common is the 7 conductor RV connector.
I set up all my trailers with them even if the trailer doesn’t have brakes.

 

[MTboatguy]

I am sure the problem is in the vehicle, and I am sure it is in the underhood power distribution center and it is most likely the secondary fuse for the right hand turn signal system because there is also a secondary fuse for the brake light, so you can blow the turn signal fuse and still have a brake light.

 

[MTboatguy]

Another area I just read about, have the dealer check the multi function switch up front, seems they have some problems with those as well in the 2017-2018 trucks. So it may have nothing to do with the wiring, but with the switch.

 

[Lancerdad34]

Update: Last evening I took the plug out of its holder and plugged it in that way. Well when I did that all lights worked. I put it back in the plug holder and plugged it in again all lights are working! Go figure! Thanks for all the help here!

Brian

 

[Horigan]

I suggest putting dielectric grease in the connectors so it stays working...