Installing a 7-Way Trailer Connector on a Trailer with 6 Wires

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Question:

My trailer has black, blue, red, green, yellow and brown wires. My 2003 Chev K2500 has the 7 blade plug receiver. Can I wire a 7 blade plug on my trailer and have running lights, electric brakes, brake lights and turn signals? I do have a brake controller.

asked by: William

0

Expert Reply:

You can certainly add a 7-way trailer connector to your trailer with 6 wires. You would simply have 1 pin on the 7-way connector that did not function. I recommend adding a 7-way molded trailer wire connector like part # H20046, and a junction box like part # 38656. We do this on all of our trailers and our customers trailers and it will make future wire maintenance much easier. I have attached an installation video of these two parts for you to check out.

Once you have all of your parts, you will want to determine the functions of each of the wires on your trailer. If you do not already know the functions of each wire, I recommend using an independent 12 volt power source (I use a vehicle battery) to apply power to each wire to see what happens. For example, if you apply power to the green wire on your trailer and your right brake light/turn signal comes on, then you know the green wire is for the right brake light and turn signal.

At the junction box, you will want to match the wires from your trailer to the wires from the 7-way harness by function, not by color. Trailer manufacturers do not stick to a standard wire color code, so it is very important to verify the function of each wire. If you choose to go with the molded harness that I recommended above, the functions of each wire are listed below.

White Wire - Ground
Red Wire - Left Turn and Brake Lights
Brown Wire - Right Turn and Brake Lights
Green Wire - Tail Lights
Blue Wire - Brake Power
Black Wire - 12 Volt Power
Yellow Wire - Auxiliary Power/Reverse Lights (This wire may not match up with the wires on your trailer)

expert reply by: John H

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Answer 1

To see a couple diagrams that show how the 6-way to 7-way adapter part #47435 is wired up check out the pictures I attached. The 6-way of this adapter has the center pin as the 12 volt circuit. That is the usual circuit that gets moved around on…

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Answer 2

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Answer 3

There is no taillight converter installed in the Adapter part #HM47425 that you referenced so if you need to go from separate to combined lights then this kit is not for you. You will need to add a converter, like the Curt #C56175. Just cut off the…

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Answer 4

No, need for pictures! I have exactly what you need. It is the Pollak 6 Pole to 4 Pole Connector Adapter item #PK12717. This will plug into your RV's 6-pin and allow you to control your Wrangler's lights through its 4-way connector.

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Answer 5

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors…

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Answer 6

For replacement Blue Ox Base Plate tabs we have the following: Tab Assemblies for Blue Ox Baseplates - Short Front/Short Back - #BLU57XR Tab Assembly for Blue Ox Baseplates - Short Front/Long Back - #BLU37XR Tab Assemblies for Blue Ox Baseplates -…

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Answer 7

The correct replacement tabs for the Blue Ox Base Plate Ki part #BX1128 which is a fit for a 2014 Jeep Grand Cherokee is the Replacement Attachment Tab Assemblies for Blue Ox Baseplate part #BLU57XR.

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Answer 8

Brake controllers are not vehicle specific items so there are not diagrams available for individual vehicles. We do have a help page on installing brake controllers that will walk you through the process, but I will briefly run through the process to…

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Answer 9

With 6 wires on your trailer, we have a good idea what they go to, however you will want to test the functions. You can use a 12V battery and connect each wire individually on the positive terminal while the negative terminal is connected to ground.…

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Answer 10

It's pretty common for vehicle batteries to die when the vehicle is being flat towed since the braking system typically draws it's power from the towed vehicle to activate. This is a problem for nearly all systems including the Brake Buddy…

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Answer 11

To connect back up lights you need to have a 7-way trailer connector on both your trailer and tow vehicle. On a 7-way the reverse lights are powered by the center pin. To connect reverse lights to the trailer's 7-way you can use 16 gauge wire…

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Answer 12

The only difference between 7-Way Utility and 7-Way RV is the color of the wires. The pin outs are the exact same so either would work just fine with the other. If you check out the picture I attached you'll see that the functions are all the…

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Installing a 7-Way Trailer Connector on a Trailer with 6 Wires

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