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Expert Answers about Toyota Pickup


  • Trailer Wiring Harness for a 1986 Toyota Truck with LED Tail Lights and Fixing Hyperflash
  • First, to fix the hyperflash problem, you may need to use something like an LED Light Bulb Load-Resistor Kit, # DI34ZR. You would need to use one for every light affected. This product was designed specifically to fix hyperflashing or burned-out bulb indicators on turn signals with LED lights. I have included a link to the installation details for reference. When you say 'deadended' do you mean that the right side signal is not separately grounded? If so, then this could be causing the...
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  • Trailer Lights are Dim When Connected to Truck
  • Sounds like you have a ground issue on your trailer. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light but can show up any time. Locate the main trailer ground wire. Disconnect the wire and clean the surface that the wire is connected on your trailer. Make sure that the connection is on bare metal. No rust, paint, dirt, or grease on the trailer's surface where...
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  • Troubleshooting 4-Way to 7-Way Adapter Not Powering Trailer Lights
  • It sounds like you are using a 4-Way to 7-Way adapter like the Tow Ready # 30717 to connect to the 7-Way on your trailer. If the trailer doesn't have electric brakes and you don't need the 12V power circuit then it's a simple plug-and-play install except for the white ground wire. The white ground wire does still need to be securely attached to a clean, bare metal surface that's free of any paint, debris, or corrosion. If you don't have this wire attached that is why your lights aren't...
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  • Troubleshooting Trailer Lights Not Working When Head Lights Turn On
  • Typically when this happens after installing a wiring harness like the Curt # C55379, it's down to one of two causes. You'll want to start by checking the ground connection on the vehicle and trailer wiring harnesses. Make sure that these are connected to a paint, rust and debris free spot on the frame. You'll also want to check for potential shorts on the wiring, where there might be bare wiring touching a metal spot on the vehicle or trailer frame. The less likely cause would be too...
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  • Troubleshooting Trailer Turn Signals that Blink at the Same Time when attached to 1989 Toyota Pickup
  • We will need to isolate the problem to the vehicle or the trailer wiring. Using a circuit tester, item # PTW2993, if needed, check the vehicle side trailer connector without a trailer connected. You should get taillight on the brown wire, stop and right turn on the green wire, stop and left turn on the yellow wire and the white wire is the ground connection. If the trailer connector at the rear of the vehicle is working properly, when there is no trailer attached, you will need to check...
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  • Troubleshooting Trailer with Non-Functioning Turn Signal Lights Behind a 1992 Toyota Pickup
  • This is the right harness for your 1992 Toyota Pickup. It sounds like you might be having a ground issue. Check the ground wire from the harness. Make sure it has direct metal to metal contact with the frame or body. Rust, corrosion and paint can insulate an electrical connection. Check the grounds for the tail lights on the trailer, make sure they have good metal to metal contact. Finally, check the the trailer ground wires, make sure again, that they have good metal-to-metal contact. You...
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  • Both Trailer Turn Signals Blink at the Same Time with 1986 Toyota Pickup Truck
  • To start, you will want to make sure you are using the appropriate wiring harness for your truck. The Tow Ready T-One harness that you referenced, # 118379, is not compatible with a 1986 Toyota Pickup. The trailer wiring harness that we recommend for a 1986 Toyota pickup is part # C59236. This harness requires a hardwire installation. Unfortunately, there are no plug-in style trailer wiring harnesses available for your truck. On the driver side the left turn signal on the truck goes to...
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  • Troubleshooting Trailer Fuses Blowing on a 1992 Toyota Truck When Put in Reverse with a Trailer
  • Sounds like your taillights and trailer lights are overdrawing your 1992 Toyota Pickup and that is why the fuse is blowing. When you put your truck in reverse you have your foot on the brake which is activating the trailer brake lights as well as the truck brake lights, and then when the reverse lights of the truck come on additional amperage is being pulled and most likely causing the fuse to blow. What needs to happen is the amperage draw of your trailer needs to be reduced. The easiest...
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  • Trailer Brake Lights/Turn Signals Do Not Work After Installing Wiring Harness on 1984 Toyota Pickup
  • Since you have tested and everything works on the vehicle side the issue must be on the trailer side. But to be sure make sure the harness you installed is properly grounded to a clean and corrosion free bare metal surface and that all the fuses related to the tail lights are good. On the trailer, first make sure the trailer connector is clean and the pins do not have any corrosion on/in them. Then make sure the main trailer connector ground is attached to a clean and corrosion free bare...
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  • No Brake Lights After Wiring A 1989 Toyota Pickup and Trailer
  • It sounds as if you may have wired your 1989 Toyota truck with a 2 wire wiring harness like part # 18002. Toyota vehicles have European wiring, which has the turn signal and brake signal circuit separated. For these vehicles a converter is required to combine the stop and turn signals for towing a trailer. For the 1989 Toyota Pickup you will need the T-One Wiring Harness, # 118379. This harness plugs inline with the vehicle tail lights and has a converter to allow the vehicle stop lights...
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  • Troubleshooting a Pinched 4-way Trailer Wire Where Only the Running Lights Function
  • It sounds like you may still have some bad connections left in your 4-way trailer wire harness. I would go back and inspect all of the wires that got pinched and make sure they are all making good connections to the correct color wire. You will also want to make sure they are taped up and insulated well from each other to prevent the wires from shorting out on each other. If that does not fix the problem I would go back and look for other areas of the harness that may have been damaged...
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  • Trailer Lights Wont Work with Headlights On
  • When we have customers tell us that their trailer lights only work when the vehicle's headlights are off then this is usually a ground issue. Did you check both the trailer side and vehicle side connector? If not I would do this first and also, by check I mean you should remove each of them, sand down the surface and then reattach with new mounting hardware. A visual inspection of the ground terminal is not sufficient to check for function. The other potential cause is that the lights...
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  • Troubleshooting 4-way Connector On 1992 Toyota Pickup Having Power But Not Powering Trailer Lights
  • Since you tested the T-Connector 4-way connector on your 1992 Toyota Pickup 4WD V6 and the tester showed that all of the functions are working but you are not getting trailer lights then there is one troubleshooting step to try. Plug the trailer into the trucks connector and turn on the turn signals or have a friend apply the brakes. Using a circuit tester like # PTW2993 test the wires on the vehicle side connector, and if you have power there then test the wires on the trailer side connector....
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  • Troubleshooting Plug and Play T-Connector Trailer Wiring Harness Not Working on a 1992 Toyota Pickup
  • As long as your vehicle is a 1992 Toyota Pickup and not some other model like a T100 pickup, you have the correct wiring harness. There are two possibilities for the symptoms you are describing. A ground issue or a short between the taillight circuit and turn signal circuits. Because there would need to be a short between both the left and right turn signal circuit and the ground I would think that would not be the issue, unless the converter box has been shorted out. Since you have already...
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  • Troubleshooting Wiring on a 1990 Toyota Pickup While Installing Curt # C55379 Harness
  • I have some suggestions to help troubleshoot your wiring issue with your 1990 Toyota Pickup and the Curt Harness # C55379. Make sure your truck is running when you are testing the trailer lights, not just having the truck in the accessory mode. By having your truck running your trailer will be receiving maximum voltage because the alternator will be running. Check your trailer connector with a circuit tester such as # PTW2993 to verify that you are receiving voltage on each pin. If you...
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  • Troubleshooting LED Lights on Trailer Not Lighting Up
  • You could remove your current Hopkins wiring and install the Hopkins # HM48895 that you referenced but I recommend simply installing load resistors like part # DI34ZR instead. These put a higher load on those light circuits which then let your current wiring know to send power. The reason that your brake controller is registering that your trailer is connected but not your lights is because it is on a completely different circuit. The P3 # 90195 that you have installed sends a small pulse...
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  • Troubleshooting Trailer Brakes Stopped Working with Brake Pedal on Truck
  • If the brake controller on your Silverado 2500 stopped working with the brake pedal then there is likely either an issue with the connection between the controller's red (brake input) wire and the brake switch wire in the truck or you might just have a blown stoplight or CHMSL fuse. You can first try looking through your truck's owner's manual to find the location for those fuses to make sure they are in good condition, replacing as needed. If this doesn't resolve the issue then you...
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  • Running Lights Not Working on Trailer
  • For starters, you will want to turn the vehicle on and test the running light circuit (brown wire) on the vehicle's 4-way with a circuit tester like part # PTW2993. If power is present, then you know the problem in on the trailer. If power is not present, then you know the problem is on the vehicle. If the error is on the vehicle side, then you will first want to start by checking the fuse box to see if any fuses associated with the trailer or running lights are blown. If not, you can...
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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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  • Troubleshooting Tekonsha Voyager Brake Controller That isnt Functioning
  • The LED should light up, whether or not a trailer is connected. If you're not getting a green light with a trailer connected, be sure to check the connector on the vehicle and the trailer. If they're corroded, it could prevent the controller from 'reading' the trailer. Without a trailer, the LED should glow red with the brake applied. I'd recommend using a circuit tester like # PTW2993 on the black wire exiting the rear of the controller. If you have voltage on that wire, power is indeed...
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