Need help with trailer lights

[TennHaynes]

What can be wrong? Brake lights work, turn signals work, tail lights don't work. I can't figure it out.

[M R Dux]

Bad bulbs or ground issue. Tail light filaments are not the same as brake/turn on bulbs like 1157. I hooked my trailer up Friday to head to the lake and had zero lights. I found broken ground to trailer in main harness.

[strmwalker]

What can be wrong? Brake lights work, turn signals work, tail lights don't work. I can't figure it out.

what type tow vehicle make and year ???

[TennHaynes]

2003 F-150.

[strmwalker]

2003 F-150.

do you have a tow package on that vehicle ???

[Atimm693]

Most newer trucks have separate trailer light fuses. It's probably those. Since it's a Ford you'll have to sort through the manual to find them.

["G"]

Most newer trucks have separate trailer light fuses. It's probably those. Since it's a Ford you'll have to sort through the manual to find them.

Exactly right....I learned that the hard way...spent three days working on it...then I found out separate fuses for trailer lights in another location on vehicle. Should be a black box under the hood that says MAIN LOAD CENTER....take the top of of it....panel has individual fuses for everything.

[strmwalker]

check the fuse #5 its a 20 amp fuse under the hood !!!! it should be mark as trailer tow relay !!!

[TennHaynes]

No Sir. No tow package.

[Slabprowler]

I had the same issue in the past and it was the ground wire!