Trailer Lights

One of the lights on my boat trailer is out, I swapped out the bulb but to no avail. What else can it be? Fuse is ok. Ground is fine. Could it be the connectors at the truck's plug?

 

Do you have a test light? When in doubt, I break mine out. $5.00 investment and I've used it hundreds of time over the past few years.

 

i wouldnt; think it would just go out but there is a check plug indicator you can can get at auto zone i think that plugs into your trucks harness and will have several lights on it. if they all don;t like up you know your problem is your truck and not your trailer

 

Thanks guys, will head over today and pick one up!

 

I've had the same problem with my boat trailer. I had the bulb go out replaced the bulb and it didn't work. The other lights on the trailer worked so i didn't think it was any wire or anything with my truck. The socket had alot of corrosion on it. I took some sand paper and sanded the corrosion off of it. I had the grease that is for electrical connection and put that in the socket. Light now works. Good Luck