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Expert Answers about Chevrolet Vehicle Lights


  • Trailer Keeps Blowing Vehicle Running Light Fuse or Trailer Running Lights
  • The problem you are having with the running lights on the trailer sounds like a short circuit somewhere. To find it the first step is to disconnect the trailer from the tow vehicle. Then use a circuit tester such as # PTW2993 to test the vehicle side connector while someone sits in the vehicle and goes through the light functions. If the running light fuse blows while testing the vehicle side connector, then that indicates the short is on the vehicle somewhere. Check the connections for...
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  • Troubleshooting Trailer Tail Lights not Working when Tow Vehicle Head Lights are On, Toyota Tundra
  • This to me sounds like a ground problem. It sounds like your tail lights function until the additional load of having the head lights of your vehicle are turned on and then the lights cut out. The reason this manifested after the vehicle swap could be a lower voltage output of your latest vehicle. Either way I would check the grounds on the tail lights of your vehicle and make sure they are making a good connection to a clean metal surface. I attached an FAQ on trailer wiring for you...
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  • Running Lights on 2001 Chevy S-10 Not Lighting Up Using Diode Kit for Flat Towing
  • The first thing you are going to want to check is if running light power is making it all the way back to the diodes installed on your 2001 Chevy S-10. You would do this by connecting the truck to the back of the RV (or other vehicle you are using) and turn the running lights on on the tow vehicle. Then use a circuit tester such as # PTW2993 if you need one. If there is no power on the input wire from the RV/tow vehicle, then the issue is somewhere ahead of the diode. It could just be...
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  • No Monitor Light on Roadmaster InvisiBrake Supplemental Braking System
  • I have attached for you below both a wiring diagram of the monitor light on the Roadmaster InvisiBrake Supplemental Braking System part # RM-8700 and troubleshooting steps from Roadmaster. If the light is not illuminating then you'll need someone to watch the brake pedal in the vehicle as you press the pedal in the motorhome to verify function. - Make certain the brake light fuse was replaced in the towed vehicle. - Make certain that the monitor wire patch cord between the two vehicles...
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  • Troubleshooting Trailer Running Light Not Working
  • If by main light you refer to the tail light (also known as a running light) on your trailer that should be on whenever your vehicle headlights are on, this function not working on the left side of your trailer could be a bad light bulb that needs replacement; it could be a result of loose wiring at the light; it could be from corrosion (either within the light itself or in the vehicle/trailer connectors); or it could be a result of a weak ground connection at the trailer or vehicle wiring. It...
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  • Turn Signals on Boat Trailer Work, But Brake Lights Do Not
  • When you state that you never had to use a converter before, do you mean with this particular vehicle? That the brake lights worked with this trailer being towed by this vehicle before, but are not working now? Or do you have a new car, and you have hooked up the trailer connector and are finding that the lights on your boat trailer are not working correctly? Most trailers use what we call a combined lighting system. This means that the brake lamp signal and turn indicator signal is combined...
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  • Troubleshooting Pop Up Camper Light Signal Working With One Vehicle and Not Another
  • It sounds like your issue is being caused by a weak ground on the pop up camper. The best place to start troubleshooting is with the ground for the right tail/brake light. It is important to ground the light to a spot on the trailer that is clean of paint, dirt, debris, rust, and corrosion. Anything between the ground wire's ring terminal/ground post of the light and the steel frame of the trailer can cause issues with the ground. If the light does have a ground wire, you can also check...
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  • Trailer Turn Signals Work but Brake Lights and Running Lights are Not Working
  • On a trailer the brake lights and turn signals are on the same circuits so when the turn signals work but not the brake lights it is a little strange. There are some common things that can cause that though. First it is possible that there is a trailer brake light fuse on the tow vehicle that is blown or missing. It could also be a stop light or CHMSL fuse. You can test the vehicle side connector without the trailer connected using a circuit tester such as # PTW2993 or a meter if you...
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  • Running Lights Not Working on an H & H Trailer with 5 Wire Trailer Connector
  • First, use a circuit tester like # PTW2993 if needed to test the brown wire to make sure it is functioning properly at the vehicle side connector. If not, then you will need to troubleshoot the vehicle. On light # 30-92-001 the green wire is the running light circuit, and the black wire is brake light/turn signal. Make sure the main trailer connector is grounded to a clean and corrosion free bare metal surface. Do the same for the lights. If the trailer has an aluminum frame, grounding...
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  • Trailer Turn Signals and Brake Lights do Not Work when Running Lights are On
  • This sounds like a ground problem or possibly a short on the vehicle side connector (on the trailer the vehicle is not working with). The first thing to check is the trailer connector on the suspect vehicle. Make sure that it is clean and free of corrosion and that the connector is properly grounded to a clean, bare metal surface. You can then use a circuit tester such as # PTW2992 to test the vehicle side connector. Have someone sit in the vehicle and go through the light functions, with...
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  • Trailer Lights Always On With 2015 Toyota RAV4
  • There are some vehicles that the running lights will stay on for a period of time after removing the key until after the doors are locked. It is a setting that can be changed on most vehicles. It's basically a courtesy light feature that when you unlock your doors with the remote the running lights will come on to help you see the vehicle and around it. The same happens when you remove the key and exit the vehicle to allow you to see around the vehicle. This usually will last 30 seconds...
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  • Trailer Lights, Driver-Side Running and Parking Light Not Working on 2015 Jeep Wrangler
  • Since you are able to get all of your vehicle lights working without the trailer connected, the issue is likely on the trailer wiring. First, check your trailer wiring ground connection for signs of a bad connection. Clean the area around your ground connection to get rid of any paint, corrosion, or other buildup. Make sure the ground wire is securely connected to bare metal on your trailer frame. Next check your trailer 4-way connector for any signs of corrosion on both inside and out,...
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  • Troubleshooting Left Turn and Running Light Signals Not Working on Trailer
  • It does sound like your trailer lights are okay and the vehicles are the problem, but it is easy enough to test each. First, check the fuse for the left turn signal and left running light as these are typically on different circuits than the hazards. That could be the issue. You can make sure the trailer's lights function correctly simply by disconnecting it from the vehicle and applying 12V power directly to each one of its circuits, one at a time, using the vehicle battery or a spare...
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  • Troubleshooting Running Lights Not Working On Trailer But Brake Lights And Turn Signals Work
  • Since just the running lights on your trailer are not working, I recommend checking the owner's manual of your tow vehicle to find the fuse for the trailer running lights and make sure it is not blown. If the fuse is OK then using a circuit tester like # PTW2993 with the head lights of your tow vehicle on check the 11 o'clock pin if you have a 7-way connector, or the connector right next to the exposed ground pin on a 4-way connector. If you do not have power to either of these pins, then...
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  • Troubleshooting Vehicle and Trailer Lights When Towing with 2013 Nissan Armada
  • If your Armada behaves normally when the trailer is not connected, and all of the vehicle's lights work as they should, and the problem only occurs when you plug in the trailer then this tells us that it is likely the issue is in the wiring on your trailer. Something as simple as corrosion inside the trailer plug (or the vehicle socket) could easily cause issues with lighting circuits or the trailer brake circuit. If there is corrosion inside the connectors two different circuits could...
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  • Troubleshooting Trailer Lights Staying On After 2017 Hyundai Santa Fe is Turned Off
  • The Curt T-Connector Vehicle Wiring Harness # C56332 receives the signals for lighting from the vehicle and sends power to the lights from the battery via the converter. Your 2017 Hyundai Santa Fe does have a welcome/surround light feature that will continue to keep some of your lights on when you either unlock your vehicle or switch off your vehicle. Typically this will have a time delay and will turn your lights off after that time has elapsed. If your trailer lights are on when the...
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  • LED Lights On Trailer Dimly Glow Even When Tow Vehicle Is Turned Off
  • If the LED trailer lights have a dim glow even when the tow vehicle is not running, that is common. Light circuits can carry a small amount of current even when the towing vehicle is turned off. If you have the trailer hooked up for extended periods you may want to just unplug the trailer harness and that would stop the lights from lighting up. Another way to stop the LEDs from glowing is to install an adapter like part # C57003. The resistors in the adapter will prevent the low-level...
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  • Does Light Kit for Railed Cargo Carriers 20174 Include Running Light Function
  • Yes, the Light Kit for Railed Cargo Carriers, Part # 20174, does include the tail/running light function. These cargo carrier lights should illuminate whenever your vehicle turn signals, brake lights and tail lights are on. You can start by unplugging the 4-pole connector and confirming that the vehicle running lights operate properly. Next use a circuit tester like # PTW2979 on the vehicle 4-pole connector to verify that it is passing a running light signal. Ground the tester and test...
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  • The LED Light on the Brake Master is Good, but Will Not Light When the Brakes are Applied
  • The Roadmaster Brake Light Relay for Towed Vehicles, item # RM-88400, is designed to keep the brake signal from overriding the towed vehicle turn signals and would not affect the LED light on the motor home dash. It could be a missed wire or loose connection somewhere. Most likely the connection at the towed vehicles brake light switch, under the dash behind the brake pedal, is disconnected or not properly installed. The red power wire should be attached to the cold side of the stop light...
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  • Trailer Right Tail Light and Turn Signal Do Not Work with Running Lights On
  • This sounds like either a bad ground connection or there is too much amperage draw from the trailer for the tow package wiring on the vehicle. Bad grounds usually show up when there is more load on a system. The bad ground can be anywhere in the system, not just at the light. The first step is to isolate the issue by disconnecting the trailer and testing the vehicle side trailer connector using a circuit tester such as # PTW2992. Have someone sit in the vehicle and run through the lighting...
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