Primary Wire - 16-Gauge - Black - per Foot

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• Troubleshooting Trailer Lights that Work Only When Cinder Block is Placed in Back of Trailer
  If your lights are working when you add weight to the back of your trailer you likely have a short. I would start off by checking the wiring directly under the location where you place the cinder block. If your grounds are securely connected to a clean, bare-metal surface then there is most likely some wires on the underside of your trailer that have a stronger connection when the block is in your trailer. Look for any places where the wiring is damaged or pinched and replace it with 16...
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• Troubleshooting Curt Custom Vehicle Wiring Harness Blowing Running Light Fuse
  The reason the Curt Custom Vehicle Wiring Harness you purchased is blowing a running light fuse is there is a short somewhere on the running light circuit. I recommend thoroughly checking the brown wire on the connector back to the connectors on your 2006 Dodge Dakota looking for any spots where the wire is showing that could short, or for any other damaged sections of wire. Any damaged spots will need to be replaced by splicing in # 16-1-1. I included a link to a helpful article on...
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• Troubleshooting Power from Connector on Pickup but No Trailer Lights
  If the connector on your pickup shows power for the lights when you test it then the issue should be on your trailer. You can verify this by connecting a different trailer to your pickup or by using a 12V battery to power the individual pins on your connector. Just ground the negative terminal and use a wire from the positive terminal to power the different pins. The most common issue with trailer lights that aren't working is a bad ground. Since none of your lights are working though...
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• Only One Tail Light Works on Trailer With 4-Way & Vehicle With 5-Way
  You should be fine with your Tacoma's 5-way and trailer's 4-way since the lighting functions will all be attached. So either the light is bad and needs replacing or, from how you are describing the wiring set up, the light that doesn't work is not properly connected. Each light should have its own wiring run to it so you may need to run wire directly to it and not through another light, which you can do with 16 gauge wire # 16-1-1. I have also added links to a couple help articles below...
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• Troubleshooting Radiator Fan With 12V Battery Where Wires Get Very Hot
  The wires may not be the correct gauge. They should not have been hot with 12V power. The motor may be drawing too much power as well. If the motor isn't overheating, than replacing the wires should solve the problem. You can use # 16-1-1 or # 12-1-1 depending on the amperage needs of your motor and the length of wire needed. Longer distances requires thicker gauge wire for proper amperage.
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• Troubleshooting Utility Trailer Light Dim on Right Side
  It sounds like the right side of your trailer may have a bad ground connection. I recommend visually inspecting your wires for missing insulation or fraying and then using a tester to see if you are getting the same voltage on each side of your trailer. If the voltage is the same, you most likely have a bad ground connection which is often found in the mounting of the lights themselves. You want a bare metal to metal connection free of corrosion or debris. You may also want to use some...
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• Running Lights on Trailer Not Working, Vehicle 7-Way Tests Good
  There is a possibility that the ground for the tail lights on your trailer is not sufficient for the running light circuit so I would start here as it is rather easy to do. However, if both sides of the trailer are not working and the other lights (stop/turn) are working then that leads me to believe you have a shorted wire. I recommend obtaining a circuit tester and testing the brown wire just behind the trailer side trailer connector while the running light circuit is active. If you don't...
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• Troubleshooting Trailer Running Lights Not Working But Trailer Connector Has Power
  Since you mentioned you are getting power to the brown running light circuit wire, but the running lights are not turning on there is few a possibilities. The most common issue is a ground is bad. I recommend checking that the running lights have a ground wire connected to clean corrosion free metal. If they ground through the studs make sure they are attached directly to metal. If the trailer has a tilt bed or is aluminum you may need to run a jumper wire from each lights ground to the...
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• What Gauge Wire Is Used For The Trailer Breakaway Switch 3802348
  The Replacement Breakaway Switch # 3802348 uses a 16 gauge wire for the connections. This should be fairly standard for any brakeaway switch, regardless of brand. We sell 16 gauge wire by the foot with part # 16-1-1, if you are in need of more wire.
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• Wire Gauge Of The Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter
  The 60 inch blue wire of part # 20036 used to make the connection to the reverse light function is 16 gauge. Additional Primary Wiring can be purchased by the foot in 16-Gauge Black # 16-1-1 if needed. A video resource is included below should you want additional information.
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• 7-Way Adapter for 2007 Toyota FJ Cruiser Towing Surge Brake Trailer
  To convert your 4-way to a 7-way to tow your trailer with surge brakes you'd want the 7-way adapter part # 37185 which your 4-way would plug into. You'd need to run the purple wire to the reverse light circuit of your FJ Cruiser to activate the reverse lockout solenoid of your surge brake actuator. For wire you could use the # 16-1-1 which we sell by the foot.
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• 1995 Gooseneck Sundowner Rewiring Components
  A junction box like the part # 277-000141 is the place to start when rewiring a trailer. Basically you'd need to mount it on the frame of the trailer in a location that allows the 7-way enough length to reach the front of the trailer. For wiring we have 10 gauge wire like part # 10-1-1 which you'd run for the ground, the 12 volt accessory, and the brake output. To run the wires for the lighting functions you could use the part # 16-4B-1 which we also sell by the foot. This a jacketed set...
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• How to Create a Better Ground for a Clearance Light on a Trailer
  Since you have already determined that it is a ground issue (which is almost always the problem) I would try sanding down the area you are installing the clearance light on. A good ground will have a solid connection to a clean, bare metal surface. If the screws are loose (as you found) or the metal has some paint or debris on it there could be some issues. If that doesn't work you can also try using a ring terminal like part # DW05737-1 and some 16 Gauge Wire # 16-1-1 to create a better...
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• Recommended Wire and Connector for 5-Way Round Application
  For a 5-way round trailer connector, I recommend the Pollak 5-Pole, Round Pin Trailer Wiring Connector - Chrome - Trailer End # PK11501. Most people will use the Bonded 4 Wire - per foot # 16-4B-1 to connect the signals and then run # 16-1-1 for the other function needed.
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• Recommended Gauge of Wiring for Trailer Lights
  Trailer wiring generally uses 16 gauge wire, part # 16-1-1. However, with a long trailer like yours you may want to go with a larger like 14 gauge # DW07550-1 or even 12 gauge # 12-1-1. Each size is sold by the foot. You will need to have the lights at the rear of the trailer of brakes and turn signals. Also since the trailer will be 10 feet wide you need clearance lights on each side.
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• Troubleshooting Trailer Wiring on 2004 Ford F-250 Super Duty
  Because you are losing functions when you connect your trailer, it sounds like you either have problems at the connectors with dirt/corrosion or you have a bad ground wire. I recommend testing each function individually using a circuit tester like # PTW2993 to test your trailer connection on your vehicle when your trailer is not connected. If you have a brake controller you will need to use the manual override to test that function. If there is an issue, check your ground wire connection...
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• Troubleshooting Boat Trailer With No Working Lights After Installing New Lights and 7-Way Connector
  I would be happy to offer some troubleshooting steps to get your boat trailer lights working. Since all of the lights are having an issue I recommend using a circuit tester like the # PTW2993 to test power wires to each of the lights on the trailer with your 7-way connector plugged into your truck and each of the functions on. If you have power to all of the lights but no lights you have a grounding issue. Depending on the lights you purchased they may ground through the mounting hardware,...
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• Wiring Diagram for Home Made Trailer
  I've linked an article on trailer wiring that includes a diagram you might find helpful. One solution to help wire everything together is to use a junction box with your trailer's 7-way connector, like # 277-000141. This way you can run all of your trailer's wires to the box instead of to the back of the connector. To wire you brakes you'll want to use 10 gauge wiring # 10-1-1. For the lights you can use 16 gauge, # 16-1-1. Both are sold by the foot. When looking into the back of...
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• Troubleshooting Trailer Lights Not Working on Old Boat Trailer With New Wiring and Lights
  To troubleshoot, let's start with the vehicle. Without the trailer connected, you will want to use a circuit tester like # PTW2993 and go through each of the functions individually to make sure they work properly with the incandescent light in the tester. I've attached a video to assist. Once you have confirmed the vehicle side trailer wiring is working properly, then you will test the trailer. You can use a 12V battery connecting a jump wire from the positive terminal to each function...
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• Troubleshooting Running Light Function on 1986 Coachmen Crusader Travel Trailer
  Although I don't have a wiring schematic for your 1986 Coachman Crusader travel trailer, I can help you determine the color coding based on function. Most of the time, the running light function is brown in color, but that isn't always the case. The best way to check is to use a circuit tester like # PTW2993 to test the function at your vehicle side connection first. I've attached an article to assist with the location. If that isn't working, then there is often a parking light fuse...
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• Troubleshooting Dim Function of Brake Light and Turn Signal on Travel Trailer
  Since the brake light and turn signal are still functioning, just are dim, it does sound like a connection issue. I recommend checking the ground for corrosion or rust and just cleaning it up and if that doesn't solve your issue, then put a circuit tester like # PTW2993 on it. The incandescent bulb in the tester should show a difference, so if it does or doesn't you have isolated which wiring needs to be checked for a short and replaced. Normally light wiring is # 16-1-1 wire.
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• 2004 Holiday Rambler Endeavor Model E40PST330H Break Controller Installation
  The red wire is supposed to be connected to the stop light switch. You'll need to use a circuit tester item # ptw2993 to find the cold side of the wire which will only have power when the brakes are applied so you can splice in the break signal. If you need more wire you can splice in 16 gauge wire item # 16-1-1.
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• Troubleshooting Trailer Running Lights Not Working When Other Functions All Work
  It is likely that there is a bad ground when only one function isn't working. Check your main ground connection on your trailer as well as the ground connection at your taillights. The taillight ground can often be in the mounting hardware if it doesn't have a separate ground wire. Make sure the connection is bare metal to metal and free of corrosion or debris. You will also want to check your trailer connector to make sure that running light pin is free of corrosion and debris as well....
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• Does Battery have to be Disconnected to Flat Tow a 2015 Ford Fiesta Manual Transmission Behind an RV
  The owner's manual for your 2015 Ford Fiesta says that for automatic models, not manual models, of the vehicle the battery needs to be disconnected to flat tow it. I cannot recommend going against the manual so the battery should be disconnected on automatic models. This is because some things in the vehicle will be powered on when you have the vehicle set up for flat towing according to the steps in the manual. You can provide power to the vehicle battery via the running light circuit...
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