trailer lights ?

[gulllakeguy]

Hi I have a problem with my trailer lights. When I switch my lights on, the tailights work on the truck but not on the trailer and the fuse is good. I even tried a different fuse too. any ideas? The brake and turn signals work fine on both.

[Macgyver55]

Sounds like you have a bad connection at the plug or a break in the brown wire somewhere on the trailer. Or if the truck is new enough the trailer fuse for the taillights may be blown. (it is a separate fuse)

[DTro]

More than likely a bad connection at the plug

[gulllakeguy]

I checked it at the plug with a tester and the turn signals and brakes work but not the running lights. So it is in the truck(2004 Ford f-250) I checked the fuse under the steering wheel and all were ok. Is there any other places that there are fuses? Could it be the actual light switch in the truck?

[Macgyver55]

Should be a separate fuse under the hood in the power distribution center.

[gulllakeguy]

That was it thanks Macgyver.

[Shack]

Yep, Mc55 hit her right on the head .

Now, the bigger question??? Why did the fuse blow?

Have you used other trailers in the past? I would check ground points on trailer. If loose and rusted, clean and tighten. Doing this will prevent the fuse from blowing again in future. At least bring some spare fuses. Also check the mounting of the lights and even where the mounts for the light connect to trailer.

Good luck dude!

[Macgyver55]

Glad to hear it! Shack is right though, something caused it to blow. You could check for frayed wires anywhere that they are able to rub. Also check the fixtures themselves for moisture in the sockets. A short to ground is what causes fuses to blow, in most cases, a bad ground will simply cause something to either not work, or work incorrectly.

[Jeremy airjer W]

Man you guys are fast!

IMO if it blows once it could have been a number of things. A basic check over for the obvious (corrosion, wiring in poor condition, replace WIRE NUTS with solder/shrinkwrap or an appropriate self sealing but connector), correct anything that looks suspicious then replace the fuse. If it blows again then it time to get a little more serious!