I'm hoping someone can give me a hand with a question I have about the lights on my TT (the ones that come on when your truck's lights are on, like at night - sorry, I'm having a brain freeze on the name of them).My turn signals, 4-ways and brake lights work fine but it appears that the lights that are supposed to be on when I have the truck's lights on don't work. I would assume that it's a connection issue somewhere. I just noticed it (since we just got the trailer out of storage) and haven't looked into it yet.Any suggestions would be appreciated. Thanks in advance for your help.

Possible you blew the high current fuse in the truck. I've done that more than once when I forget to discount my wires from inside the truck bed and it causes it to short out blowing the fuse.

Tail lights and running/clearance lights. If you have the standard 7 pin connnector you can use a short piece of wire to jumper pin 4 (+12v) to pin 3 (tail/running lights) to see if the trailer wiring works.If the lights come on with the jumper, then you have a problem with your tow vehicle or the connection between the two. Could be a contact in the connector not making good contact.One step at a time.Trailer wiring info.

Marker lights, running lights, etc. If they worked previously, I would look for a fuse on the TV or camper. Then check the voltage on the TV wiring conector and continuity on the camper wiring connector.

Tail lights and marker lights not working?Pictures and labeling of trailer and truck connectionsOn the vehicle side, confirm by using a hand held meter or test light that 12V is present on the tail light pin when lights are "on" in the vehicle (green, 1 o' clock).Confirm that 12V is present in the trailer's tail light circuit by finding a wire junction or at a fixture.Many times, the tail light circuit won't light because a ground connection is lost. The best first place to check is at the rear tail lights. Sometimes, corrosion will interfere with the ground connection.

lights on camper | Good Sam Community

10 Replies

RoyB
Explorer II
Jun 17, 2014
One of these 7-way plug testers is pretty neat to have when you get into troubleshoot mode. I added one to my RV TOOL box... They also make one for the 4-way plugs as well. Got mine from AMAZON

Roy Ken
Chad_Jen
Explorer
Jun 17, 2014
Thanks to all. Fortunately it was the easiest fix - a blown fuse under the hood of the truck. I checked last night after I got home.
handye9
Explorer II
Jun 16, 2014
Check your owners manual for the truck. Most likely there is a fuse / relay blown. The fuse box is probably onder the hood.

My F250 has a 20 amp relay that controls nothing but trailer running lights. Had a Nissan Titan, and Toyota Tundra, that also had a specific fuse for trailer running lights.
cut_up
Explorer
Jun 16, 2014
I had the same problem when I picked up my new Jay Flight. The guy that installed my anti-sway told me the lights were not working, and said he checked that the lights on the trailer were in fact working. When I got home, the first thing I did was check the fuse box and found a 15 amp fuse blown. Problem solved.
beemerphile1
Explorer
Jun 16, 2014
Most likely problem is corrosion at the truck-trailer connection. Plug and unplug several times to clean the connection.
westend
Explorer
Jun 16, 2014
Tail lights and marker lights not working?

Pictures and labeling of trailer and truck connectionsOn the vehicle side, confirm by using a hand held meter or test light that 12V is present on the tail light pin when lights are "on" in the vehicle (green, 1 o' clock).
Confirm that 12V is present in the trailer's tail light circuit by finding a wire junction or at a fixture.

Many times, the tail light circuit won't light because a ground connection is lost. The best first place to check is at the rear tail lights. Sometimes, corrosion will interfere with the ground connection.
rbpru
Explorer II
Jun 16, 2014
Marker lights, running lights, etc. If they worked previously, I would look for a fuse on the TV or camper. Then check the voltage on the TV wiring conector and continuity on the camper wiring connector.
BB_TX
Nomad
Jun 16, 2014
Tail lights and running/clearance lights.

If you have the standard 7 pin connnector you can use a short piece of wire to jumper pin 4 (+12v) to pin 3 (tail/running lights) to see if the trailer wiring works.

If the lights come on with the jumper, then you have a problem with your tow vehicle or the connection between the two. Could be a contact in the connector not making good contact.

One step at a time.

Trailer wiring info.
chris3403
Explorer
Jun 16, 2014
Possible you blew the high current fuse in the truck. I've done that more than once when I forget to discount my wires from inside the truck bed and it causes it to short out blowing the fuse.
sbowman871
Explorer
Jun 16, 2014
Marker lights?

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lights on camper

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