2014 Sundowner 3 horse bumper pull trailer light question

[deerefan]

All lights work except interior lights for tack room and horse area. They do not work hooked to my 15 Armada or my 15 F150. Is there a fuse in the trailer or relay/fuses needed for this circuit in the above mentioned vehicles?

 

[JPRambo]

in my '13 silverado there is a fuse for power to the trailer. Interior lights could be hooked to that.

 

[Topzide]

Have you tried to see if lights work with running lights on? Must setups use the 12 volt power from vehicle to charge break-away battery and auxiliary lights. This would only be available through a 7 pin hook-up. Pick up a 7 pin tester through NAPA or other store or online. Very helpful tool for cheking the vehicle receptacle. If there's 12 volt at vehicle, than need to check trailer harness for loose/broken connections. Good luck.

 

[grsthegreat]

my old 2 horse had switches on the light fixtures themselves and worked anytime 7 pin was installed. my newer 30' 5th wheel horse trailer has 2 switches on outside by tailgate. 1 runs exterior lights, the other interior lights. i have never seen a fuse on any horse trailer. they use vehicles fuses.

 

[deerefan]

Have you tried to see if lights work with running lights on? Must setups use the 12 volt power from vehicle to charge break-away battery and auxiliary lights. This would only be available through a 7 pin hook-up. Pick up a 7 pin tester through NAPA or other store or online. Very helpful tool for cheking the vehicle receptacle. If there's 12 volt at vehicle, than need to check trailer harness for loose/broken connections. Good luck.

I did. Thats what is weird...every single light works but for tack room and horse area.

 

[RustyA]

If it's wired to 12v hot pin on 7 way generally tow vehicle must be running or have ignition on to provide power to circuit. Keeps trailer from draining tow vehicle battery if lights are left on?

 

[aczlan]

I did. Thats what is weird...every single light works but for tack room and horse area.

2015 F150 went to a new system (no relay and separate fuse like on older models).
Have you tried applying power to the correct pins on the trailer side plug and seeing if the lights will turn on?

Aaron Z

 

[deerefan]

2015 F150 went to a new system (no relay and separate fuse like on older models).
Have you tried applying power to the correct pins on the trailer side plug and seeing if the lights will turn on?

Aaron Z

I tried with vehicles running, lights on and off. No luck. How would I apply power to pins on trailer side?

 

[aczlan]

I tried with vehicles running, lights on and off. No luck. How would I apply power to pins on trailer side?

A battery or an old style "dumb" battery charger and a couple of jumper wires is how I would do it.
Looks like you will need pins 1 and 4 (4:30 and 10:30 if looking at the end of the trailer plug that goes into the truck) per this diagram:


Source: dieselhub.com/img/figures/7-pin-trailer-connector.jpg

Aaron Z

 

[deerefan]

A battery or an old style "dumb" battery charger and a couple of jumper wires is how I would do it.
Looks like you will need pins 1 and 4 (4:30 and 10:30 if looking at the end of the trailer plug that goes into the truck) per this diagram:

View attachment 668923
Source: dieselhub.com/img/figures/7-pin-trailer-connector.jpg

Aaron Z

This is a big help. Thanks!! I will test and report back this evening.