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Expert Answers about Emergency Vehicle Lights


  • Troubleshooting Stop/Turn Circuits Not Working After Tekonsha Harness # 118540 Install
  • The T-One Vehicle Wiring Harness # 118540 with it's single connector should be tapping into the vehicle stop/turn signals. If yours isn't active but the vehicle signals are working I'd first try unplugging and plugging the connectors in to see if there's maybe just a connection issue that needs to be cleared out. Next I would check under the hood for any trailer wiring related fuses/relays and replace as needed.
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  • Troubleshooting Trailer Running Lights Circuit Not Functioning
  • The running light circuit is on a different wire than the turn signals and emergency flashers so most likely there's an issue on circuit specifically. Typically when we see this problem it's corrosion on that circuit of the trailer connectors that cause the problem. Try inspecting the pins of the connector on both the vehicle and trailer to see if you can find any corrosion and clean as needed. I also attached a help article on trailer wiring for you to check out as well.
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  • Troubleshooting Trailer Running Lights Not Working on Toyota Pickup
  • The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118379 is a confirmed fit for your 1992 Toyota pickup. With the turn signals working and emergency lights working but the running lights not working, the issue most likely is in the ground wire of your trailer. Here is how to troubleshoot. Use a circuit tester like # PTW2993 to check the pin function on each of the 3 power pins on your 4-way when the trailer is not connected. The running lights will be the brown...
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  • Emergency Lights Not Working Properly On a Trailer Behind a 2005 Chevy Suburban
  • The first thing I would do is try to narrow down whether the wiring problem is on the vehicle or the trailer side. With the trailer not connected, use a circuit tester, like part # PTW2993, and check all the pins on the 7-way. Make sure you activate that pin function as you test it. Then plug in your adapter, and test that. If all these items check out OK, then the problem is somewhere on your trailer. Trace the wires for the left-hand signal and brake back from the trailer connector....
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  • No Trailer Turn Signals After Installing New Tail Lights
  • The first step for troubleshooting the trailer turn signal lights is to test the vehicle side connector. If you are not getting any power on this circuit then you will need to check the fuse box for any blown fuses. If you have an aftermarket trailer wiring harness then test the turn signal wires before and after the converter box to ensure the signal is both entering and leaving. Finally, check the ground for the vehicle side trailer connector. If you do get power to the vehicle side...
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  • Troubleshooting Non-working Running Lights on a Trailer Being Pulled by a 2012 Suzuki Equator
  • To determine if the issue is on the vehicle or the trailer you will need to disconnect the trailer and use a circuit tester such as # PTW2993 to test the vehicle side connector. With the running lights on, test the pins on the vehicle side connector. If there is no power at the connector, then the issue is on the truck. If there is power at the vehicle connector, then the issue is on the trailer. You can check to see if the tow package fuses and relays are present or just bad by using...
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  • Voyager Trailer Brake Controller Stopped Working After Emergency Braking
  • I suppose there could have been a power surge during the emergency braking event that knocked out the controller. What you will need to do is use a circuit tester, # PTW2993, to test the black wire leading to the controller. It should show power. If it does not, then the brake controller power fuse is blown (if it just plugs into the vehicle) or the circuit breaker keeps tripping. Replacing the fuse or circuit breaker should reestablish the power to the controller. If there is power on...
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  • Troubleshooting 2 Lights Blinking on the Reese Trailer Connector Adapter # 78118
  • The only reason two of the lights would be blinking under normal circumstances would be if the circuits that were blinking where the left and right stop/turn signals and it was because you had the emergency flashers of your vehicle on. Otherwise that indicates you have some kind of short and I would recommend you check the back of your vehicle connector for corrosion or any other obvious problem such as exposed wire and fix as necessary.
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  • Trailer Signal Lights Malfunctioning After Installing Optronics Tail Light
  • From what I can see in your question, it seems like the most likely cause for the signal lights on your trailer to be malfunctioning after installing the Optronics Sealed Stop, Turn and Tail Light # STL78RB is the ground connection on your trailer. You mentioned grounding the white wire from the new light to the metal body of the door hinges. I strongly recommend finding a more suitable ground on the main trailer frame for this wire. A weak or bad ground can certainly lead to many different...
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  • Why Would Stoplights and Turn Signals Not be Bright on Trailer Wiring
  • There may have been a slight weak ground that was allowing some of the lower power draw functions to still work. The grounds on both the trailer side and the vehicle side, as well as the grounds for all of the trailer lights will need to be attached to clean and corrosion free bare metal surfaces. A weak ground issue would show up as soon as there is higher power draw on the system. Brake lights light up brighter and require more power so that is when the issue showed up. Making sure...
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  • Adapter to Fix Furrion Camera System Not Working with 2022 GMC Sierra 3500
  • Thank you for all of the information! The issue is actually your 2022 GMC Sierra 3500. For whatever reason GM decided to make the running light circuit an issue so you'll need the 7-Way Vehicle Power Adapter for Furrion RV Observation Camera # FR87PR to make your Furrion camera system compatible with your new truck. Attached is an installation video for you to check out.
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  • Troubleshooting Trailer Wiring When Running Lights Do Not Work
  • It sounds like there is a ground wire issue on your trailer. Since you said you checked the vehicle harness, and it checks out we can rule that out as the issue. You will want to use a circuit tester like part # PTW2993 and check the wires coming out of the trailer connector when plugged into the vehicle. Make sure the pin for the ground on the trailer connector is not corroded or bent. Check the lights and make sure the ground wires are securely fastened to a clean bare metal surface,...
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  • Troubleshooting Wiring When All Lights Work Except Brake Lights
  • You will need to check the stop light and/or CHMSL fuses in the towing vehicle. You may find that is causing the issue. You can then check to see if there are separate fuses or relays for the tow package wiring. You can check the owner's manual to find the locations of any fuses/relays. If the fuses and relays all check out it may be a problem with the ground. You will want to make certain both the vehicle and trailer side ground wires are attached to clean bare metal surfaces. Also make...
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  • Troubleshooting Water Buffalo Utility Trailer Running Lights Not Working
  • You do need the running lights for night time driving or you can receive a ticket. The running lights on your utility trailer can be checked using a circuit tester like # PTW2993. This will allow you to check the trailer connector on your tow vehicle for that running light power. Then you can clean that connection if needed and then check the wiring on your trailer corresponding to that pin. It is likely there is a ground connection issue or a wire short causing your lights not to function...
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  • What is the Standard Wiring Color Code for a 4-Way Trailer Wiring System
  • The standard for a 4-Pole trailer wiring system is as follows: white - ground, brown - tail/running lights, yellow - left turn and brake, green - right turn and brake. You may want to use a circuit tester, like part # PTW2993, to make sure the vehicle connector is working properly. Often times bad ground connections can cause problems so check and make sure the ground wire on both the vehicle side and trailer side is attached to the metal frames, clear of paint and corrosion. I have included...
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  • Brake Pedal Causing Turn Signals to Flash Briefly With Tail Light Converter 118158
  • Thank you for your purchase of the Vehicle to Vehicle Tail Light Converter # 118158. Based on the scenario you mentioned, it does sound like there is likely backfeeding happening that is causing the turn signals to briefly flash when you hit the brakes. The best remedy for this would be what you mentioned, which is to use diodes, the Roadmaster Hy-Power Diodes # RM-792. I have added a link below to a video review for you to check out as well if you'd like.
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  • How To Determine Which Wires Are Your Reverse Light Wires On A 2022 Toyota Highlander
  • The easiest way to determine which wire is your reverse light wire so you can install the Universal Installation Kit for Trailer Brake Controller # ETBC7, is to go to the rear of the vehicle where your taillights are located and pull the housings off of the vehicle to have access to those wires. From here, you're going to want to turn the car on, engage the emergency brake, and then shift the vehicle into reverse. At this point your housing should be off of the vehicle, and the wires...
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  • Why Would Green Light Stay On When Brakes are Pressed Tekonsha Voyager Brake Controller
  • Did you mean the e-brake of your vehicle or did you mean the manual override lever of the controller? The emergency brake isn't connected to the brake controller in any way so it shouldn't cause the controller to activate. The green light on the Tekonsha Voyager # 39510 indicates that the controller senses that a trailer is connected. If the knob on the left side of the controller is turned up and the brakes of the tow vehicle are applied the light should begin to pulsate between orange...
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  • Troubleshooting Replacement Bargman LED Trailer Lights
  • In order to separate the turn signals from the brake lights on your trailer with your new Bargman LED Red/Amber tail lights, you will just need to install the Tow Ready Vehicle to Vehicle Tail Light Converter # 118158 on the trailer side behind the 7-Way connector. You will locate the wire on the 7-Way that is for the left turn and brake and attach it to the yellow wire on the converter input side. Then connect the wire from the right turn and stop to the green wire on the input side....
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  • No Running Lights After Installing Trailer Wiring Harness on a 2014 Honda CR-V
  • It could possibly be the ground wire on the wiring harness on your 2014 Honda CR-V. Make sure it is attached to a clean bare metal non-painted or coated surface. It could also be a fuse. The harness comes with a small 7.5 amp fuse and if that is not installed or is blown then that could be the problem as well. To test to see if the harness is the problem use a circuit tester such as # PTW2993. Test the wires going into the converter box from the vehicle. When the vehicle running lights...
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