Trailer Lights !! -sos-please help

[U.P. Tundra]

Turn your truck off and grab your ohm meter. Find a good ground for your meter's ground lead on the truck, and then check your plug to find the ground pin on the plug. My bet is you'll have an open connection where it hooks into the vehilcle. Probally corrosion where it grounds.

[jliltd]

For around $13 you can have a 7-way tester plug like this:

7 Way Trailer Connector Vehicle Tester TR20117 : Trailer hitch bike rack and trailer hitches - etrailer.com

That's a great start. If no lights at all on tester = ground problem. Otherwise each light will tell you what's not working.

Also, I find the 07+ tundra receptacle tends to get dirty despite the spring-loaded protective cover. I have to knock the dust off the leads by rattling the trailer plug while inserting in and out a few times to clean things up.