Expert Answers about GMC Vehicle Lights

• Troubleshooting Multiple Trailer Lights Malfunctioning with Different Tow Vehicles
• It's a little weird that both your trailers are experiencing the same thing regardless of which vehicle they are connected to, but the best way to narrow everything down is to use a circuit tester # PTW2993 at the back of your vehicles to make sure the pins are sending the correct functions, and then apply 12V power to the various pins on your trailers 7-Ways to check and see how the lights act. If you're seeing power on multiple pins for your vehicles then it could be that your vehicle...
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• Are Resistors Needed When Changing a Trailer Tail Lights From Incandescent To LED?
• The hyper flashing issue you are referring to is not typically found on trailers and is more of a vehicle issue. Since the power sent to the trailer gets its signal from the vehicle the trailers lights like the # CE86FR are going to flash at the same rate as the vehicles lights flash. This happens on the trailer regardless if they are LED or Incandescent. An issue some newer vehicles have is they sense the LED lights as a bulb out issue. These would require a Adapter # 20142 if you have...
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• Curt 4-Way Vehicle Wiring Harness Continues To Have Trailer Lights On When Ignition Is Switched Off
• First thing you will want to check Steve is the settings on your 2020 Jeep Cherokee. Often times the running lights can stay on even after the ignition is switched off which would explain why the Curt Harness # C56406 allows the trailer lights to remain on after the ignition is switched off. Since this harness ties into the tail lights on your Cherokee to get their signal they should operate only when the vehicle lights operate. If the lights on the trailer are coming on when the vehicle...
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• Recommended Trailer Wiring for a 2024 Volkswagen Atlas
• The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C67WR you're looking at is not going trick your Atlas into thinking there is a trailer plugged in. All this wiring harness does is provide your vehicle with a 4-flat so you can plug in lights for a trailer or for any hitch mounted accessories. To trick your Atlas on thinking there is a trailer connected, you're going to need to splice into your taillight wiring. For your light bar issue, it sounds like there...
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• Can wiring harness for trailer lights be installed on 2024 Ford Bronco?
• Yes! You can install the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C87BR if your 2024 Bronco does not have LED tail lights. If it DOES have LED tail lights then you'll instead need Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C42WR. Each of these kits include everything you'll need for the installation and use. I attached an installation video, but basically you'll connect the converter's black wire to battery positive,...
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• Will The Curt Dinghy Wire Harness # C96JR Interfere With Activation Of A Blue Ox Patriot
• Hey Dave, The Curt Custom Tail Light Wiring Kit for Towed Vehicles # C96JR would not be intertwined or interfere with the Blue Ox Patriot # BLU37TR. This wire harness is simply plugging into the motorhome and Gladiator tail lights to copy the light signals from the motorhome over to the Gladiator. If you active the brakes in the motorhome the light will transfer over to the Gladiator and the Patriot would sense the decrease in inertia and activate. You shouldn't have an issues using these...
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• Where Does Reverse Light Circuit Go on 4-Way to 7-Way Adapter
• Hey Steven, you will still need to track down the reverse light circuit on your vehicle for the reverse light circuit of the 7-way adapter like the part # 37185. It can be harder to find on newer vehicles but you would need to use a circuit tester like the part # PTW2993 to test the wiring bundle that runs to the taillights till you find the one that only has voltage when in reverse.
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• Troubleshooting Trailer Lights
• Yes it could be a bad ground, and it would not matter if the vehicle has LED lights and the trailer doesn't as that combo happens quite a bit. Check both your vehicle and trailer connectors for corrosion, which can be green or white in color. A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you are going to need to replace the plug with # HM38134 for the trailer side. As for the grounds, make sure they are attached to bare metal surfaces...
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• Creating Wiring Adapter To Go From 2024 Toyota Sienna To Control Lights On European Wired Trailer
• Very close to that Steve, I am recommending 2 converters but both of them would be mounted on the vehicle side. The ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT would mount to the tail light wiring and will power the trailers lighting functions. But since your trailer has the separate European wiring with the separate tail lights you could wire the 2 to 3 Wire Tail Light Converter # C56196 into a 4-Way # HM48110 so it can be connected and disconnected as needed for other trailers...
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• What Does A Curt Powered Tail Light Converter Do?
• No problem, Arlo. The Curt S0602U-R1 is a powered taillight converter, similar to part # C59236. Basically the converter is part of a trailer wiring harness, probably for a 4-flat trailer plug. The converter is wired directly to the vehicles battery. This helps prevent the vehicles electrical system from being overloaded when powering trailer lights. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As...
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• 2013 Toyota Sienna Replacement Trailer Wiring Harness Recommendation
• Thanks for reaching out! We do have replacement trailer wiring for your 2013 Toyota Sienna and for that I recommend the Tekonsha T-One Vehicle Wiring Harness # 118498 because of how reliable it is. If your current wiring has this same style where it pulls power directly from your Sienna battery via the power wire then I recommend checking to see if the fuse needs to be replaced before you replace the entire wiring harness. The fuse should be located in the engine bay near your battery. Attached...
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• Help Troubleshooting Trailer Lights Always On Connected To 2023 Toyota Highlander Tekonsha 7-Way
• The Tekonsha OEM Replacement Vehicle Wiring Harness # TK57VR(22125) does have a converter. The square box on the harness is the converter which senses power for the tail lights, turn signals and brakes to send to the appropriate functions of the trailer. What it sounds like to me is the trailer running lights are some how sending power to the brake lights which are brighter. I would start by using a Test Light # PTW2993 or 7-way Tester # C66NR to ensure the correct functions on the connector...
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• Braking System And Tow Bar Wiring For A 2022 Jeep Wrangler Sport S
• For your 2022 Jeep Wrangler, I recommend using the Curt Custom Tail Light Wiring Kit for Towed Vehicles # C96JR which will not require you to splice any of your wiring and plug directly into factory wiring. As far as braking system goes, I recommend the Roadmaster InvisiBrake # RM-8700. This is a one time setup, supplemental braking system, that will get wired directly to the battery and the electrical harness. You are also going to need a stop light kit # RM-751490, which will ensure...
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• Troubleshooting Dimming Trailer Lights When Braking And Using The Turn Signal
• Hi Doug, Based on the symptoms you're describing it just sounds like you're dealing with a lack of power. Everything works until you start putting too much of a load on the harness. Does your Suburban have a factory tow package/7-way or did you have to install one aftermarket? Older vehicles used to pull power from the vehicle tail lights to power the trailer lights and ended up drawing too much power and causing the lights to dim. In this kind of situation you can either replace the wiring...
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• How to charge towed vehicle with RV.
• The Nighthawk has built-in wires that can be used to charge your towed vehicle's battery when you also use Roadmaster charge line # RM-156-25 on the vehicle side to connect to the towed battery. If you don't have charge line coming through your RV's 7 way already then you'll also need the RV side charge line kit # RM-156-75. The Demco Duo does not charge the battery. The running lights on your towed vehicle should be turning on via the wires coming from the RV to your Towed vehicle via...
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• Difference Between Wiring Harnesses for a 2009 Ford Flex
• Yes, you are due to the power draw from the trailer. The dedicated 12v line that comes with the Curt T-Connector Vehicle Wiring Harness item # C56343 pulls power from your Ford's battery to operate the lighting functions on your trailer. This harness will power both incandescent and LED lights without having any issues like blinker's running faster. The Hopkins Plug-In Simple Vehicle Wiring Harness item # HM11140275 pulls it's power directly from the rear lights. If your trailer has a...
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• Does Diode Roadmaster Lighting Kit # RM-154 Also Light up the Side Clearance Lights of Tow Vehicle
• With the # RM-154 installed on your 2021 Jeep Wrangler the only lights that will function are the rear ones. If you have the rear ones working you're good.
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• Tow Bar Lighting Recommendation for Chevy Equinox
• The only other electrical item you would need to flat tow your Equinox would be a lighting solution Eddie. For lighting you can use the diode kit, # RM-15267, and not have to worry about cutting into the taillight housing. This will splice into your taillight wiring to allow your tow vehicle to control the taillight assemblies of the towed vehicle. This comes with a round 6-way connector that you will install on the front of your towed vehicle and enough coiled wire to go from there to the RV.
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• Troubleshooting Loss Of Left Turn Signal With Roadmaster Diode Wiring Kit # RM-154
• If only the left turn signal isn't working on the towed vehicle and is working on the motorhome then you most likely have a loose or damaged wire running to the left tail light, the diodes are bad, or the # RM-154 wiring was installed incorrectly. You essentially have two power sources and the diode just acts as a sort of transfer switch to allow the motorhome to power the lights when connected or the vehicle to power the light when not connected. If the vehicle has separate lighting...
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