It's either a blown fuse or a short in the wiring. I would check underneath the trailer for a bad wire. I had the same thing happen to me about 4 months ago and one of the wires was no good and it affected all the lights so I just ran new one all the way back and that fixed the problem. The wiring on these trailers aren't run very well, so the wire strands tend to break but you can tell because the outside of the wire looks fine when in fact its broken inside the wire. If its a fuse, just look on the fuse panel diagram on your truck for the right fuse.
SOURCE: no power to trailer running lights
Hi,
This is a known issue and to my knowledge there was even a recall order to correct this fault. It would seem the the wiring harness itself is the reason. You may want to reference these pages here and/or here.
Should you however prefer to perform a DIY, then you would need a DVM to check for voltages. This page shows the possible wiring scheme used by most manufacturers for trailer configuration.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
SOURCE: Can't get any of my boat trailer lights working on 01 Tundra!
Probably one or more (fuse(s) ) under hood in power distribution box.
SOURCE: We have a 2003 f250 super duty. We have no power
Check fuse #6 20amp on your interior fuse panel it may be blown. The relays are located in an auxillary relay box located under the hood on the drivers side fender near the firewall. The system uses 2 relays. One relay turns on for left turn signal, other relay turns on for right signal. Both relays turn on for brake lamps. The fuse #6 is more likely the problem. If the fuse is blown, replace it, wiggle the wiring on the trailer while someone steps on brakes to check for shorts.
4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).
4 way tow vehicle side.
4 way trailer side.
5 Way Systems
Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5 way tow vehicle side.
5 way trailer side.
6 Way System, Rectangle Plug
3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6 way tow vehicle side.
6 way trailer side.
6 Way Systems, Round Plug
Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.
6 way tow vehicle side.
6 way trailer side.
7 Way Systems
Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.
7 way RV flat blade tow vehicle side.
7 way RV flat blade trailer side.
93 views
Usually answered in minutes!
×