Trailer wiring problem - Nissan Forum
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#1 Old Sep 13th, 2006, 11:42 AM
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Trailer wiring problem

Hi,
I have a problem with my trailer wiring, the turn signals and the brake lights work OK, but the
running lights or parking lights are not coming on, I went all the way to the factory connector, under the truck bed, and there still no power.
Is there a fuse some where that I missed, I checked all the fuses in the engine compartment and they are all OK, what am I missing.

Thank you.
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#2 Old Sep 13th, 2006, 01:20 PM
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Does your truck have a factory tow package? If it does, you can get a tester to plug into your connector on your truck to check for problems. I had an 05' before I got my 06' and U-haul installed my hitch and wiring. They didn't install the relay that comes with the factory kit and I had alot of problems with my trailer lights working correctly.
#3 Old Sep 13th, 2006, 04:11 PM
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Yes, my 2006 frontier has the factory wiring, but the dealer tells me that I need a relay or relays, the dealer says to check on the passanger side kickboard or under the dashboard on the driver side to see if the relays are there, if someone knows please let me know what I need or what the dealer is talking about. Thank you

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#4 Old Sep 14th, 2006, 01:31 PM
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Can't you just strip back one of the wires going to the taillights and solder in a jump wire to your wiring connector at the truck end? If you get voltage there, then trailer lights will work if that's hooked up OK. A $2 test light will help you diagnose and find wires for this.
#5 Old Sep 14th, 2006, 02:12 PM
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You can go to courtesyparts.com and look up the wiring harness for trailer lights. It has the installation instructions online and you can see the relays. I would think if it had one on from the factory though that it would have the relays. Like I said though, my 05' didn't have the relays and I had problems all the time with my trailer lights. The factory wiring harness for a 4-pin is about $50 and for a 7-pin it's about $65. It comes with the relays and everything you need.
#6 Old Sep 14th, 2006, 07:24 PM
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Going by an '05, you should have two sets of relays. One near the driver rear under the bed and another in the front passenger kick panel which may be tucked up high and wrapped in foam tape. I'll try to find a diagram. Z
#7 Old Sep 14th, 2006, 08:41 PM
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Note: for an '05 7 pin RV

Last edited by Z_Rated; Sep 14th, 2006 at 09:00 PM.
#8 Old Sep 15th, 2006, 12:21 AM
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Part #999T8 BR000 for '05 and '06 7-pin are the same so previous post should apply according to Courtesy Nissan. Hope that helps, Z
#9 Old Sep 18th, 2006, 06:44 PM
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Quick Fix

Quote:
Originally Posted by Cusser
Can't you just strip back one of the wires going to the taillights and solder in a jump wire to your wiring connector at the truck end? If you get voltage there, then trailer lights will work if that's hooked up OK. A $2 test light will help you diagnose and find wires for this.
This was an easy fix that worked for me on my 05 LE 4x4. I removed the two bolts holding the left rear tail light assembly in, popped out the running light bulb and with the test light found the Gray wire was the one I was looking for. Then went under the left rear of the truck and found the gray wire again stripped and soldered the jumper wire, went over to my trailer wires and located the running light wire in my case it was a brown one soldered the jumper wire and presto Running Lights!! (The dealer wanted $77.00 for the relays)

I Goggled 05 Frontier trailer light problems and found this forum it is very informative and useful site. Now I am a newbie in your forum.

Thank You all
#10 Old Sep 18th, 2006, 07:52 PM
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The dealer (Nissan) parts are manufactured for the proper operation of your trailer lights when you are towing. There is no need to cut and splice any wires that can bring trouble in the future. Since the brake lights and turn signals are on seperate circuits, they use the plug and play relays to make sure everything works well without any chance of overloading a circuit. Just my 2 cents.
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#11 Old Sep 20th, 2006, 01:21 PM
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You should NOT be cutting and splicing wires.

1) The system has a dedicated ciurcuit for the trailor lights and trailor brakes for a reason. With the trucks brake light circuit (a light load circuit) powering the trailor brakes and the trailor brake lights, you will overload the circuit, possibly blowing a fuse (hopefully) or worse, starting a fire.

2) There is a TSB concerning a body control module that needs to be replaced by the dealer. Research this on nissanhelp.com under TSB. This module has to be replaced due to a possibility of a fire if the trailor brake wiring on the trailor is faulty.

3) 77$ is a lot less than the 500 or 1000 dollar deductable you'd have to pay... worse if it's financed without gap insurance.

Nissan made a dedicated loop for the trailor side of things to isolate issues with the electrical system. It's very important that it be done right. Obviously, those of you who tow a boat trailor and just use lights, it's not a huge issue, as 4 more bulbs in the system are certainly within tolerance. But if you are powering trailor brakes, you better have it done right.

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15.9 @ 90mph totally STOCK :D
1991 Pontiac Firebird T/A
12.08 @ 114 N/A - 355rwhp/340rwtrq
#12 Old Sep 21st, 2006, 09:02 PM
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Guys thank you for all your help,
I went to the Nissan dealer and I bought the trailer kit for $60.00, it included 3 relays, 2 harneses and some hardware along with the instructions, I installed it it was a breeze and it works fine.
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#13 Old Sep 21st, 2006, 10:38 PM
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Good news and a wise choice in my opinion. Enjoy, Z
#14 Old Jun 4th, 2014, 09:22 AM
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I have a 2003 Nissan frontier crew cab. it has factory 4 pin wiring harness for trailers I took it to uhaul to have a 7 pin harness put in and now my electronic ignition fuse keeps blowing. which also controls my windows and alarm system
#15 Old Jun 4th, 2014, 11:03 PM
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If it happened since U-Haul installed the 7-pin connector, I would take it back to them and make them fix it!
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