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Expert Answers about Nissan Wiring


  • Troubleshooting Stop/Turn Signals on Trailer Wiring Not Functioning on a 2005 Nissan Frontier
  • It really sounds like you are missing the two blue relays like part # 38666-1 from the relay box under the hood of your 2005 Nissan Frontier. I would recommend you double check that you replaced the correct relays. In some of the Nissan relay boxes there are two sets of blue relays. It is possible that you replaced the wrong set of two. Another possibility is that the grounds of your trailer aren't sufficient. Check the grounds of your taillight assemblies, make sure they are connected...
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  • Troubleshooting Running Lights and Brake Lights Not Functioning on a Newly Rewired Trailer
  • Since the circuits that are giving you problems are related to the circuits that draw the most amperage to illuminate it makes me think that your grounds aren't quite strong enough for your setup. I would verify that all of the light assemblies are connected to clean metal surfaces if they ground through their mounting hardware. Also, make sure the main ground from the trailer 4-way is connected to a clean metal surface on your trailer frame. I attached a couple FAQ articles that...
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  • Trailer Brake Lights are Dim or Do Not Work with Running Lights On Towed by 1993 Nissan Pathfinder
  • Curt trailer wiring harness # C56175 is one of the correct options for the 1993 Nissan Pathfinder. I am not sure what those other numbers are although HOP48895 could be a reference to a Hopkins trailer wiring harness. It sounds like there is a ground issue either where the converter is grounded or on the trailer. Make sure that the converter ground is attached to a clean metal surface. There should be no paint or corrosion. If it is sharing a ground try moving it to its own ground location. Ground...
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  • Trailer Running Lights Do Not Work on a Boat Trailer Towed by a 2011 Nissan Frontier
  • On your 2011 Nissan Frontier there could be a blown or missing relay in the tow package wiring. You will want to consult the truck owners manual for all of the fuse and relay locations for the tow package wiring. The best way to check a relay is to use a known good relay in place of a potential bad one. It is possible that there is an in-cab relay that is missing on your Frontier, # 38666-1, but this is normally not the case on the Frontiers. You can also test the vehicle side trailer...
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  • Trailer Running Lights Not Working After Installing Wiring Harness on a 2007 Nissan Xterra
  • A lot depends on which wiring harness you installed and how your vehicle was equipped from the factory. For the 2007 Nissan Xterra, if it did not come with a 4-Way or 7-Way trailer connector from the factory then the vehicle will not have the relays needed to power the wiring harness. Or if it does have the relays, or you bought a harness that came with the relays, like # 118525 or # 118266, then it is possible that you will need an additional relay in the in-cab fuse panel to power...
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  • Only Right Turn Signal Works on Factory 7-Way Trailer Connector on 2004 Nissan Pathfinder Armada
  • Using your circuit tester, test the wires in the harness behind the 7-Way. That way you can determine if the power is making it that far which would indicate a problem in the connector itself. If there is no power there as well then it still could be fuses or relays. On some Nissan vehicles there is another relay that is in the in-cab fuse box. Use the owners manual to locate all of the fuses/relays related to the tow package and make sure they are present and working. If that one relay...
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  • 12 Volt Warning Lights Stays on After Install 4 to 7-Way Converter on a 2006 Nissan Pathfinder
  • First we need to determine why that light is coming on in the first place. If it is coming on after you have installed adapter # C57674 then there is either a draw on the circuit or the vehicle thinks there is. Normally this is caused by a dirty trailer connector or corrosion but since it is a new installation that does not seem likely. The 12 volt power wire (black) is supposed to be installed via a 40 amp circuit breaker, # PK54540. If connected directly to the battery, that may be...
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  • Trailer Running Lights Do Not Work on Trailer Towed by 2007 Nissan Frontier
  • On some Nissan vehicles, there are relays that are required to fully activate a trailer wiring harness. If the truck did not come with a factory tow package then you will need the relays. The wiring kit we offer that comes with the relays is # 118525. The relays by themselves are # C57000. However, in some cases there is an additional relayed required that can be obtained by the dealer. Since you have power on the left and right signals and brakes, it sounds like you just need this additional...
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  • Left Trailer Brake Light Does Not Work on New Trailer Towed by 2001 Nissan Pathfinder
  • The first thing you are going to want to do is test the 7-Way on the Pathfinder using a circuit tester like # 3808 if needed. The pins in the 3:00 and 9:00 positions are the turn signal/brake light pins. Have someone engage the left and right turn signals and then the brakes, 1 at a time, while you test with a circuit tester. If all of the functions are correct on the 7-Way then that indicates a problem on the trailer. If the signals are not correct on the 7-Way then you may have a dirty...
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  • Troubleshooting Trailer Tail Lights not Working on a 2004 Nissan Titan Towing a 2006 Coachman 30 ft
  • The first thing I would do is check for voltage at the trailer connector on your 2004 Nissan Titan. You could use a circuit tester like our part # 3808 to test for the correct voltage on the trailer connector. Check out the video I attached that shows how this is done. If the voltage is good then you know the problem is in the trailer and not your 2004 Nissan Titan. What you can do is check the trailer side and vehicle side trailer connectors. You will want to look for any dirt or corrosion...
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  • Only One Tail Light is Working On Trailer Using Wiring Harness 119178KIT on a 2003 Nissan Xterra
  • Switching the tail and turn/brake wires on harness # 119178KIT should not cause it to fail. It sounds like the issue is a bad ground on the trailer. First, to make sure the harness is working properly, use the circuit tester to test the 4-Way end of the harness without the trailer connected. If you are getting the correct signals on the 4-Way, that would confirm the issue is on the trailer. If the signals are incorrect on the 4-Way, test the wires leading into the converter from the...
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  • Trailer Turn Signals Only Work if Running Lights and Brake Lights are On, 2007 Nissan Quest
  • This could be a ground problem. A bad ground connection can cause all sorts of problems. First check the trailer connectors on the vehicle and on the trailer for any dirt or corrosion and clean them out. Corrosion can also build up behind the connectors where the wires attach. On the vehicle side, make sure that the main ground is attached to a clean bare metal surface on the frame. On the trailer side connector, again make sure that the main ground is attached to a clean metal surface. Use...
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  • Trailer Lights are Not Working on a Boat Trailer Towed by a 2007 Nissan Frontier with Tow Package
  • To rule out the wiring harness on your 2007 Nissan Frontier as the problem, you can test it using a circuit tester like # 3808 if needed. Test the pins on the 4-Way end to make sure all functions are working properly. If they are then that indicates an issue on the trailer side. If they are not, then you could have a faulty wiring harness. The # 119179KIT is actually not the recommended harness for your truck, though it could be used. For a 2007 Nissan Frontier with factory tow package,...
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  • Running Lights on Trailer are Not Working or On All the Time Using Adapter # 37385
  • I recommend testing the 7-Way trailer connector without the adapter plugged in using a circuit tester like # 3808 if needed. You can use the included picture to determine what the functions should be. It is possible that something does not match up between the 7-Way and the adpater. If the 7-Way is functioning properly, plug in the adapter and test again using the 4-Way picture included. If the signals coming out the 4-Way side do not match up, you may need to re-pin the adapter. Also...
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  • Trailer Lights have Stopped Working on a 2004 Nissan Titan with Factory Tow Package
  • This sounds like a ground problem. What you can do is start by check the trailer side and vehicle side trailer connectors. You will want to look for any dirt or corrosion in or behind the trailer connectors. Corrosion can cause any number of lighting issues. Next move on to checking the ground connections for each connector to see that they are attached to clean and corrosion free bare metal surfaces. You can then check the tail lights themselves. Again you are looking to see that...
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  • Troubleshooting Trailer Wiring on a 2002 Nissan Maxima
  • Most likely there was a short at some point and the # 118175KIT was damaged and now it is behaving in the strange way that you described. Before you replace it with a # 119178KIT I would recommend that you go over all of the connections to make sure that the problem is not just wires shorting out somewhere. If the wiring looks good I would recommend you purchase a Trailer Wiring Kit # 119178KIT and replace the unit that is currently in your vehicle. I attached an installation video...
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  • Trailer Turn Signals/Brake Lights Not Working on Trailer Towed by 2004 Nissan Titan
  • This does sound like a bad or missing relay. You can test the 7-Way connector without the trailer attached to see if you get any signal at all on the turn signal/brake light circuit. If you do get a signal but the lights are not working on the trailer, it could be that the extra load from the trailer lights is not allowing them to function properly. No signal would indicate a problem further up, most likely a blown fuse or relay. The 2004 Nissan Titan should only need 2 relays out of...
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  • No Tail Lights at the Trailer Connector on a 2010 Nissan Titan
  • It sounds like the trailer wiring running light fuse may be blown. This fuse is located in a power distribution box under the hood at the rear of the drivers side of the 2010 Nissan Titan. Once the fuse box is located check the legend on the lid to determine the correct fuse to check. If this does not solve the issue, let me know, I will be glad to look into the issue further.
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  • TroubleshootingTrailer Running Light Issues on a 2006 Nissan Titan Using Factory Style 7-Way # 30608
  • it sounds as if one of the relays is not in the correct location or a fuse is blown. I would double check the owners manual to determine the location of all the towing relays and fuses and see if everything is in the correct spot and in good working order. I have included a link to the installation instructions and a video showing installation on a 2006 Nissan Titan for reference. There could be one additional relay needed. If you look under the dash, and to the left of the steering...
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  • Troubleshooting Left Turn and Brake Lights Not Workign on a Trailer Towed by a 2004 Nissan Armada
  • The problem you are experiencing could be associated with a bad ground and/or corrosion in the trailer side or vehicle side connectors. I would start by cleaning out any dirt or corrosion from the front and back of the trailer connectors to see if that fixes the problem. If not, I would move on to checking the ground on the trailer. Make sure the ground from the trailer plug is attached to a clean metal surface. Then you can check the grounds at the tail lights. On many trailers, the...
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  • How to get Running Lights to Work at the Trailer Plug on a 2004 Nissan Armada
  • You will need another Relay. The relay you will need is a small blue relay included in part # C57000. There is a relay socket under the dash just to the left of the steering column. Since your vehicle did not have the towing package installed at the factory this relay was not installed and will be needed to power the tail lights at the 7-Way and 4-way connector. The under dash connector will have 4 wires going into it. They will be Red/light blue, brown, black and red. This relay will...
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  • Troubleshooting Tail Light Converter and Tail Light Circuit on Trailer Towed by 2007 Nissan Frontier
  • So the brake lights and turn signals are working fine but not the running lights, is that correct? Step one would be to use a circuit tester like part # 40376 on your current trailer connector. Test the pin that corresponds with the brown wire leading to the trailer connector. If this light shows power while the headlights on the vehicle are activated, the problem exists on the trailer itself and not on the vehicle. Trace the tail light circuit which is usually the brown wire back along...
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  • Troubleshooting No Trailer Running Lights on a 2008 Nissan Frontier
  • If the harness you installed is aftermarket and not from the factory, then the taillights will not work unless you have a factory tow package. If you do not have a factory tow package, you can use a different harness, # 119179KIT. I have included installation details and an installation video below. I checked a colleagues truck, he has a 2004 model, so there may be some differences. But, there are some fuses under your hood, passenger side, that may say something like HD tail light....
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  • Powered and Non Powered Trailer Light Converter Wiring on 2000 Nissan Frontier - Lights Not Working-
  • On this 2000 Nissan Frontier it sounds like it is a ground issue. On many of the import trucks it is hard to find a good ground on the vehicle. To test this you might try a jumper wire from the license plate ground wire to the ground on the trailer harness. If that works then just use the license plate ground wire connection as a permanent ground.
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  • Everything Works Except Trailer Running Lights After Wiring is Installed on a 2006 Nissan Armada
  • I thought this one over for a while and could not come up with a definite solution. I asked our installer and he has not had the opportunity to install a harness on this vehicle yet. I then jumped on the internet and found a couple of interesting notes on the 2006 Armada. Apparently there is a relay socket under the dash just to the left of the steering column. Since your vehicle did not have the towing package installed at the factory this relay was not installed and will be needed to...
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