7 way socket not working

enblethen wrote:
OP says it’s a 2002 ram 1500

I see that. Overlooked before posting.:S

OP says it’s a 2002 ram 1500

What model and make truck do you have. If it is Chevrolet, check the fuse diagram-should be Stud #1-that takes a 50 amp fuse. If missing, you need to install one. If in place, check to see if it is blown. My 2006, 2013 and 2018 had them in place when I bought them. Buddies 2006 did not have one.

This is the under the hood fuse box located in front of the battery on the drivers side. I believe #11 is really #12 since there are two 11's. It may not use all of the fuses, but it should at least have some of them.



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Thanks everyone. I’ll start with these ideas this evening. For reference it’s a 2002 ram 1500

Just a heads up on my truck the trailer lights are controlled by relays under the hood and they may blow if you pull the 7 way plug while the truck is on. I don't know if all Ford HD trucks are like this.

You can also buy a cheap tester from Amazon

My truck has a quick connector on the reverse side of the plug so that they can mount the plug into the bumper before installing the bumper, the attaching the wiring harness after the bumper is mounted. Look for and check that connection.

Well you have a few options. #1 do you have a test meter of some kind or even a 12 volt test light to see if you are getting at the plug? If so see if you are getting any current to any of the blades in the socket.

Are you dealing with a 4 wire flat pug or a 7 bladed round plug
Check your ground. Just take a standard automotive jumper cable and connect the black wire to a bare metal spot on the truck and on the trailer. Do the lights work now?

Get out the owners manual or look it up online and then check any fuse labeled "trailer" and replace any that are blown.

crawl under the back of the truck and see if the socket is even wired up.

Give us the year make an dmodel of the truck and we can help find the fuses for you.

You may have to remove the receptacle on the truck then slide back the protective sleeve to inspect the connections. They may be corroded or loose, it's a common problem. Don't lose the tiny grub screw.

First guess is the fuse for trailer connector. Depending on tow vehicle, there could be one fuse that powers all the lighting circuits to the trailer connector.
Others have separate fuses for each function.