40 Ft 5-Way Trailer Wiring Harness - Wishbone Style - 30" Ground - 5' Auxiliary Wire

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• Replacing 5-Way Trailer Harness That Has 7 Wires
  When a 4-Way or 5-Way pin wiring harness for a trailer has more wires than pins, like the Optronics # A40W5B, it just means that the manufacturer is trying to make it easier on the installer. In your case it sounds like your trailer has 2 ground wires and 2 running light wires that run down either side of the trailer. If this is the case then all you have to do is splice the browns together and the whites together with your new harness and everything should work great! I have attached...
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• Replacing 5-Way on Trailer that Used 8 Wires
  The # A40W5B would be a really great choice although it only has 5 wires ran to it. You'd just need to combine all of the similar wire colors to the single circuit of the new 5-way. The brown and brown/green would go to just the brown of the new 5-way.
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• Where Does Blue Wire of Trailer Wiring 5-Way Normally Run to on Trailer
  So the blue wire of the 5-ways like the # A40W5B normally runs to the reverse lockout solenoid of a surge brake actuator like what you described having. The blue wire on the vehicle side of the wiring runs to the reverse light circuit. This allows the solenoid to have voltage when the vehicle is put in reverse preventing the brakes from applying. This runs right to the back of the actuator on the trailer coupler which is why you don't see the wiring ran to the back of the trailer.
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• Determining Wiring Functions On Trailer To Install New 4-way Connector
  Typically there is a white, green, brown, Yellow/Green and brown, and a yellow wire so since you do not have a dedicated yellow wire you will need to test wire functions by using connecting the brown, green, yellow/brown, and green brown one at a time to the positive terminal of a battery while grounding the white wire and seeing which functions come on with each wire. Since the colors on your old connector are not standard you will need to make the connections by function and not the color...
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• Wishbone Trailer Wiring Harness for a Magic Tilt Boat Trailer
  I believe you have what is referred to as a wishbone wiring harness. A wishbone wiring harness has 6 wires and is the same as a 4-way for the exception that it has both running light wires ran to the trailer connectors as opposed to splicing them together and then running them to the trailer connector. The functions should be as follows: Green - Right Turn/Brake Yellow - Left Turn/Brake Yellow/Brown - Left Running Light Green/Brown - Right Running Light White - Ground Red - Reverse Lockout...
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• Replacement Trailer Wiring Harness For a Boat Trailer Using a 5-Way Flat Connector
  Currently the only wiring harnesses we have with a 5-way flat connector are like the 25 Ft 5-Way Trailer Wiring Harness # A25W5B and 40 FT Harness # A40W5B. These harnesses use 6 wires coming from the connector. It has a short 5' blue wire to run to the surge brake electric lockout, a short 30" ground wire to attach to the trailer frame, 2 brown wires for the running lights on either side of the trailer, a green wire for the passenger brake/turn signal and a yellow wire for the drivers...
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• Wire Gauge Size of the 40 Ft 5-Way Trailer Wiring Harness A40W5B
  The 40 Ft 5-Way Trailer Wiring Harness part # A40W5B uses 20 gauge wire according to Optronics. This is pretty standard and will work for the vast majority of trailers without issue.The Wesbar 5-Pole Flat Connector part # W002290 uses larger 16 gauge wire if that is what you are looking for.
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• Available 5-Flat Wishbone-Type Trailer Connectors
  We do not carry (and I have not seen) a 5-flat type trailer connector with the many multiple wires for each pin that you describe. We DO have wishbone 5-flat connectors like # A40W5B and # W002290 which have two brown running light wires to simplify connection to the tail lights on both sides of a trailer. What you describe sounds like a custom-made part. I can understand the three white (ground) wires especially if the trailer were made of aluminum which makes establishing multiple grounds...
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• What Length Wiring Harness Is Needed For a Boat Trailer Measuring 22-1/2' From Tail Light To Tongue?
  With having 22'6" from your tail light location to the tongue on your trailer I recommend going with at least a 30' wiring harness. The additional length is needed so you will be able to route your wiring on the frame to the lights and to have enough to connect to the tow vehicle. We do have a 30', 4-Way Flat Harness # W002230 or a 40', 5-Way Harness # A40W5B depending if your boat trailer has a surge brake coupler with electric lockout. I recommend having 2' of wiring past the tongue so...
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• Trailer Wiring Connector for Triton 8x10 Aluminum Snowmobile Trailer
  For your wiring, you will need to test your wire functions to know which one connects where. I recommend using a 12v battery and simply connecting the negative terminal to the trailer frame and then connecting the power to each wire at the connector individually to determine function. It is not uncommon to have two wires running to one function location for each side of the trailer so there aren't any jumper wires across the frame needed from side to side. I've attached an article...
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• Wiring Needed to Connect Surge Brake Reverse Lockout to Trailer Wiring
  Not every boat trailer will have the reverse light circuit completed so you'll just need to complete this circuit. Most likely you have a 4-way now so you'd want to swap that out to a 5-way and run the 5th circuit to the reverse lock out solenoid. For that we have the part # A40W5B. The other wire of the solenoid will need to ground to the trailer frame.
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• 4-Way Trailer Wiring Recommendation for a Utility Trailer
  A 5-way is usually seen on trailers that have either reverse lights or a reverse lockout for a surge brake system. If you have no need for a 5-way you could use a 4-way like the part # W787268. If you did want to install a 5-way you would want the part # A40W5B. A 4-way connector on a tow vehicle would still plug into a 5-way on a trailer. The fifth circuit just wouldn't be active. To make the install simpler and cleaner a junction box like part # 38656 would be a great option. Check...
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• Replacement Trailer Side Wiring Harness for a 1996 Yacht Club PWC Trailer
  Trailer side wiring harnesses are not specific to the trailer so you can use any one that has the proper connector and length for your 1996 Yacht Club PWC trailer. I have included a link to the trailer side harnesses for you. If your trailer has a 4-Way flat connector a popular option is wishbone harness # A35W42B. A wishbone harness has 2 wires connected to the running light pin so you won't have to run jumper wires from one side of the trailer to the other for running lights. If your...
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• What are the Functions of a 4-Way Flat Trailer Wiring Connector with 5 Wires
  What you are describing is called a wishbone harness. This is different than a 5-Way flat connector like # A40W5B that you have referenced. A wishbone harness will have 5 wires, 2 of them going to the running light pin which is right next to the ground pin. This is so you do not have to splice in a jumper wire to go from one tail light to the other for the running light function. A 5-Way flat will have 5 wires (though there are also wishbone 5-Ways) and the extra pin is usually attached...
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• What is Thickest Gauge 5-Way Trailer Wiring Harness
  The 5-way harness we have that has the thickest gauge wire is the Hopkins # HM47910 which has 16 gauge wire. The # A40W5B you referenced uses 20 gauge wire and the other part number you mentioned is a lighting kit and not a 5-way.
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• Need Wiring and 5 Way Connector for 26 FT Boat Trailer with Surge Brakes
  When it comes to replacing the wiring on your boat trailer with surge brakes, I recommend using our 40 FT Wishbone 5-Way Trailer Harness with 30" Ground and 5 ft. Blue Wire, # A40W5B. I have included a short video for you. If by chance your tow vehicle is equipped with a 7-way connector, now would be a great time to make the change on the trailer. Should you ever find the need to tow the boat with another vehicle, the 7-way connector is much more universal connector and no adapter would...
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• Wiring 5-Flat Connectors on Jeep and Trailer
  It sounds like your trailer has a 4-flat wishbone connector, which will have 5 wires with two of them going to the tail light wires. If your trailer has brakes you will need to wire a 5-flat # HM37908 on your Jeep. For this harness, the white wire is the ground wire, the yellow is left turn/brake light, the green is right turn/brake light, the brown is tail lights and the blue is reverse lights. Your trailer will also need a 5-flat # A40W5B, which has a blue wire which disengages the surge...
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• Wiring a 5 Flat That Has 8 Wires
  There is not going to be a 5 flat that has 8 wires; the functions of the 8 wires are likely ground, running light circuit (split into 2 wires at the plug), left turn, right turn, brake lights (possibly split at the plug), and output to reverse lockout. What you will need to do is use a circuit tester such as # PTW2993 to determine the functions of the wires and wire them to 5 flat # A40W5B in the traditional manner of a 5-way which is ground, running lights, left turn/brake, right turn/brake...
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• What are the Functions of a 5-Way Flat Trailer Connector with 8 Wires
  On a 5-Way trailer connector, usually found on boat trailers, the pin on the end furthest from the ground pin is used on an electric reverse lockout on the trailer coupler. This is so when you put the vehicle in reverse, it will single a solenoid on the coupler and not allow fluid to go back to the brakes so you can back up without the brakes engaging. If this is what is on your trailer then you would not want to switch to a 4-Way connector unless you also switched to free-backing brakes. It...
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• 8 Wire Boat Trailer Wiring to 5-Way Plug on Truck
  There is not going to be a 5 flat that has 8 wires; the functions of the 8 wires are likely ground, running light circuit (split into 2 wires at the plug), left turn, right turn, brake lights (possibly split at the plug), and output to reverse lockout. What you will need to do is use a circuit tester such as # PTW2993 to determine the functions of the wires and wire them to 5-flat # A40W5B in the traditional manner of a 5-way which is ground, running lights, left turn/brake, right turn/brake...
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• Recommended Wishbone Wiring Harness to Rewire Trailer with Surge Brakes
  Rewiring your trailer is something that you can absolutely do easily and there are harnesses called wishbone harnesses that don't require any wiring across the trailer frame. I recommend the 35 ft. Wishbone 4-Way Trailer Wiring Harness with 42" Ground Wire # A35W42B. I've attached a review video as well as an installation video to assist. I've also attached an article on wiring to assist with diagrams. If you have the electric reverse lockout on your trailer coupler, you may want the...
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• What are the Functions of a 5-Way Flat Trailer Connector with 6 Wires
  It sounds like you have what is called a wishbone harness like # A40W5B as an example. This type of harness will have 2 wires that share the running light circuit. This is so you can use two wires, one for each side of the trailer, for running light functions so you don't have to run a jumper wire from one side of the trailer to the other. The brown/yellow would be the left side and the brown/green would be the right side. Usually the green only is right turn signal/brake lights, yellow...
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• Replacement 5-Way Trailer Wiring for Boat Trailer
  For new 5-way wiring what you'll need is the part # A40W5B. This will handle all of the wiring that runs from the connector back to the lighting assemblies as well as for a reverse lock out solenoid. Surge brakes don't always require wiring as they don't always have reverse lock out solenoids. It's very possible yours does not have one so wiring may not be needed. If you see a solenoid at the back of the actuator on the brake line you will want to run the blue wire of the 5-way to it. I...
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• How To Re-Wire Your Boat Trailer's 5 Way Wiring And Install New LED Lights
  I recommend using 40 Ft 5-Way Trailer Wiring Harness # A40W5B, which is a kit that will replace your entire 5 way boat wiring setup and give you the 5 way connection at the front of the trailer. The lighting wires are 40 feet long, which will be more than enough. It comes with a 30" ground wire (white) that will be connected to the frame of your trailer. The blue wire is 60" and will be connected to your brake solenoid if you have one; your trailer may not require this, as it may use a...
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