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Discussion Starter · #1 ·
I'm running out of ideas here. I have the OEM 7 Pin trailer wiring kit. All hooked up correctly as far as I can tell. Brake lights and turn signals work but I have no running lights. This is verified by the test light. Checked the fuses under the hood, wiring on the frame looked OK, pulled the relays in the kick plate and swapped them and still nothing. I checked the wife's Xterra that has the same setup and hers works fine. I get a light on the tail lights, brakes, battery and turn signals.

It seems to me that I either have a blown fuse somewhere (all lights on the truck work) or the wire is broke, which seems odd since the brake lights work.

Anyone got any ideas here? Anyone ever have an issue like this with the factory hookup?
 

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The side markers and tail lights share the same circuit and wiring on the trailer.

The actual brake lights are a separate circuit and wiring.

Does all of the trailer lighting work when it's hooked to the Xterra?

Get a test light or multi-meter and do some testing at the plug on the truck. Google the wiring diagrams for a standard 7 pin plug and see if you have 12v on the pin that is for the tail and side markers. Turn the parking lights on to test. Remember you'll have one pin that is 12v constant hot, so don't get it confused with the tail/side markers.

Work your way either forward or backwards depending on what you find. If you have power at the plug on the truck, then look at the trailer wiring and plug. If no power on the truck plug, work your way forward.

It's a process of elimination and likely a very simple solution.

Be sure you have a sold ground on the trailer to the truck. A flakey ground can cause all kinds of odd problems.
 

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Discussion Starter · #4 ·
I had a similar issue once, turned out to be an odd fuse under the hood.
Leaning toward this. Everything on the plug checked out with the test light except the running lights. I'm not getting power to the plug for the running lights. I have to stop and get some spare fuses anyway. Be a little bit before I can get to this since the weather here sucks the next few days. Thank you for the responses!
 

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Has it ever worked? I had one that was new and didn't work. Started following the wiring forward from the trailer plug. First plug had power at the wire. Looked in the connector and the pin was folded over.

But if it worked at any time, that rules out bad assembly. and you are looking for that fuse.
 

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Discussion Starter · #8 · (Edited)
I did search. Found a lot of people with aftermarket stuff that doesn't work. Mines an 09. Not the same ipdm as newer trucks. Swapped the trailer tow fuse, the ttow rev light fuse and both blue relays. Nada. Test light shows nothing and the multimeter is giving me inconsistent voltage. Battery connection at plug is strong. Traced back the wiring, nothing obvious.

I don't know to be honest if it ever worked. It's been on the truck for a long time but pulled my first trailer last month and had no running lights.

I get two clicks from the relays in pass footwell too.
 

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Discussion Starter · #9 ·
Got it! Trailer tow fuse was only making contact on one leg. Bent the tang and bam, trailer light contact on the plug lights up on the test light.

Should have known. Second time I've ad that issue with a fuse in this thing.
 

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Good to hear it’s all working fine now, thanks for the update and not leaving us hanging.

Clint
 
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