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Expert Answers about Wiring


  • Installation of the Wiring Harness Brake Controller Functions on a 2003 Chevy Trailblazer
  • First, I suggest you use a circuit tester kit such as #PTW2992 to confirm the function of each vehicle wire before connecting them to the pigtail leads for the brake controller. Find the one wire that has 12V power all the time, one that has power only when you press the brake pedal, and two that carry no voltage when tested. Remove the quick connector plug on the brake controller # HM47295 and splice the 4 wires to the function wires under the dash. The 4 wires on the brake controller...
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  • Brake Controller that Shows No Power and Starts Smoking
  • The wires DO NOT match up color for color. It sounds as if the controller was wired incorrectly, and is most likely inoperable. There are two different color wiring harnesses that Dodge used. If one of the wires on the harness was green, the wires should mate up as follows: The white wire on the harness with the red stripe would supply the 12V, and would connect with the black brake controller wire. The blue wire on the harness with the white stripe provides the braking signal from the...
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  • Troubleshooting Wiring for a Reverse Lockout Solenoid on an Old Boat Trailer
  • Reverse lockout solenoids will have two wires as you have seen. One wire is grounded to the trailer and one wire is attached to a reverse light wire coming from the tow vehicle. On most lockout solenoids it does not matter which wire is grounded and which wire is connected to the reverse light wire. Since I am not sure what solenoid you are using or how old it is, I recommend tracing both wires as far as you can. The ground wire should be attached to the frame somewhere on the trailer....
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  • Brake Controller Installed on 2001 Ford Van Causes Turn Signal to Malfunction
  • You are using the factory pigtail provided when you purchased the vehicle, not the # C51322, is that correct? If this is the case, the factory pigtail uses a different wire color code than the aftermarket ones, which match up color for color. Before proceeding further, lets make sure you have the pigtail wired correctly to the brake controller. An incorrectly wired harness or pigtail could cause the problem you describe. Over the years, Ford has made two different factory pigtails, one...
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  • How to Wire 3 Wire Trailer Tail Lights
  • To determine the correct wiring for your trailer you will need to use a circuit tester, item # PTW2993, and attach the wires from the connector by function only. The light wires should be as follows, red is the stop turn wire and the black is the running light wire, the white wire is the ground wire and should be connected to a suitable ground on the trailer frame. The easiest way to get it right is to connect the taillight wire, usually brown from the 6-Way connector (see link) to the...
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  • How To Identify What Wire Goes To What On a 2005 Pop Up Camper
  • With trailer wiring the wire colors are only a guide and not everyone always uses the same color wires for every circuit. The best way to ensure that you have the correct wires is to either follow the wires to their connection or to test each wire to determine what it controls on your 2005 pop up camper. Often times the wiring is ran to a junction box. This may also help you to determine where the wiring is ran to. The ground wire is generally exposed and the easiest to identify. Once...
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  • Wiring Steps When Installing The Fogatti Tankless Water Heater
  • The Fogatti RV Tankless Water Heater # LSB44FR is still a 12v system you'll just need to determine which wire, black or white, is the power and which is the ground wire. Each of these wires is typically labeled from the factory so you never need to guess but I reached out to the manufacturer since I haven't ran into one with a white wire instead of a red wire to confirm and was able to determine that the white wire is your ground and the red wire is your power. The two blue wires will...
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  • Wire Color Functions of Optronics Clearance Light # MCL44AB
  • On the Optronics clearance light part # MCL44AB the black wire is the power wire and the white wire is the ground. S you would need to wire that accordingly to what you have on your trailer. You can ground the white wire to the frame of the trailer or you can run it to a ground wire.
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  • Connecting 5 Wires From a Trailer to a 7-Way Trailer Connector
  • The best solution for your situation would be to use a circuit tester, like part # PTW2993, to wire your trailer wires to a seven-way trailer connector, like part # A7WCB. Wiring by function is the best way to make sure you have the trailer connector wired correctly. Be sure you know what the black wire function is on the trailer. It will probably be for a twelve-volt battery or for reverse lights, but it could be used for something else. The location for the black wire in the connector...
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  • How to Locate and Fix Damage to a Brake Controller Power Wire
  • The first thing I would do is to check the ground wire. Make sure the ground wire is connected and a good ground (attached to bare metal, clean of paint). If the ground is good to go, then you can look at running a new black power wire. You would cut the black wire fairly close to the brake controller, splice in your new wire and run it to a direct power source (the battery). Deka Jacketed 2 Wire # 10-2-1 is available by the foot if you need wire, it gives you the black (power) wire and...
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  • Troubleshooting Trailer Wiring When Connecting a New 4-Flat Trailer Connector
  • It sounds like you picked up a 5 wire trailer connector rather than a 4 wire connector. A 4 wire trailer connector will only have a white wire for ground, brown for tail lights, green for right turn and stop and yellow for left turn and stop. The red wire on the connector that you purchased is most likely for reverse lights or a trailer with separate turn signals such as a motorcycle trailer. If you do not have reverse lights or separate turn and brake signals, then you can simply tie off...
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  • Tips for Wiring a 2009 Volkswagen Jetta Wolfsburg Edition with a 4-Way Trailer Wiring Harness
  • What it seems to boil down to is if the vehicle has a 2 wire system or a 3 wire system. On a 2 wire system, you would ground the red wire with the white wire. This is because the stop and turn signal lights are combined on one circuit. On a 3 wire system, the turn signals are separate from the stop light so the wire needs to be connected to the dedicated brake light wire. What it sounds like is that the running light brown wire is getting connected to the wrong wire on the vehicle. VW...
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  • Malfunctioning Lights on a 2006 Dodge Dakota Wiring Harness
  • It sounds like someone may have installed the wrong part or tried to do something that should not be done. It sounds like there are one of more incorrect connects that are causing some problems. There are custom fit wiring harnesses that use the connectors on the back of the taillights and do not require splicing. White wires should be grounded to truck and trailer frames with clean, metal to metal contact, trailer side white to trailer frame, vehicle side white to vehicle frame. You can...
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  • Troubleshooting Brake Controller Install on 2013 Chevy Silverado Where Install Wires Dont Match
  • If you have found the correct brake controller install wire bundle under the dash of your 2013 Chevy Silverado and those last two wire don't match what the typical wire colors are you will need to test them to determine their function. But first you will need to make a few connections under the hood of your truck so that the circuits are all active. Once that is done you will need a circuit tester like part # PTW2993 to test the wires. The wire that has 12 volts of power all the time...
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  • Troubleshooting P-2 Brake Controller Installation on a 2008 Chevy 1500
  • Since there is no power at the bundled wires under the dash the problem is most likely under the hood at the power distribution box. The power for the brake controller is supplied from a wire that is located between the driver-side front fender and the power distribution box (see photo link). There is a ring terminal on the end of the wire and it should be ran to the left power stud located at the front of the power distribution box with a M6 nut, item # 185916. If the wire is connected...
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  • Choosing The Correct Stop Light Switch Wire On A 2011 GMC Sierra
  • It may be possible that the red wire coming from the brake controller is spliced into the wrong circuit or has become loose. The first thing you will want to do is ensure you have the red wire spliced into the stoplight switch on the vehicle's wiring harness which is the light blue or orange wire. The black wire running from the brake controller will need to be connected to the red wire on the vehicle's wiring harness. The blue wire coming from the brake controller will need to be tied...
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  • Power On Green and Yellow Wires with Circuit Protected Vehicle Wiring Harness 119250KIT
  • It sounds like you may have an issue with the wiring for the Tekonsha ZCI Circuit Protected Vehicle Wiring Harness part # 119250KIT. There should not be 12 volts on the right turn/stop (green wire) and left turn/stop (yellow wire) at the trailer controller with the headlights on, only the running light circuit (brown wire). I recommend you check the wires that you have the green, yellow, and red wires on the above harness connected to. If your Sprinter Van uses the same wire for both...
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  • Troubleshooting Curt Tri-Flex Brake Controller Installed on 2007 Dodge Ram 1500
  • If everything has been connected properly, you should be seeing a decimal point that indicates power is reaching the brake controller. Since you are not, use a circuit tester like part # PTW2993 on the black wire exiting the rear of the controller (the controller, not the factory pigtail.) You should see 12-volts on this wire. If you do not get power, check that the OE pigtail is wired correctly to the brake controller. If your factory pigtail has a green wire, it should be connected to...
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  • Troubleshooting Trailer Wiring With Wire Colors Not Being Same On All Wiring
  • I always recommend going of the position of the terminals and their function versus trusting the wire colors. Since wire colors is not a requirement to be followed by every manufacturer they can use which ever color wires they want. If you are combining products from different manufacturers you will need to use their wiring guide to determine each wires function and not rely on the color or the wiring. I have included an image showing the functions for the 7-way connectors below. Remember...
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  • Testing Electric Brakes Wiring On 2007 Camper Trailer
  • As far as wiring the brakes on your trailer, there is no polarity on the brake magnets so the wiring is really quite simple. Just attach one wire to the wire that carries the brake signal form the tow vehicle and the other wire needs to be grounded to the trailer frame. You can use a circuit tester like part # 40376 to test the wiring on the trailer. Have someone apply the manual override on the brake controller while you test the wires.
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