How To Wire a 7-Way Trailer Plug To A Vehicle With 6 Wires

Question

Question:

I am trying to wire but color code doesnt work because there are no red and blue wire only two brown wires. I cant get it to even show power now, if I wire correctly by the four colors that I can follow. The two brown wires are the problem.

asked by: Robin

0

Expert Reply:

I am not sure which side you are referring to, the vehicle or trailer but regardless you will need to test the wires for function instead of color matching. In order to do this on the trailer side you will need to apply 12 volt power to each wire and see which light it illuminates. In order to do this for the vehicle side you will need test each wire with a circuit tester while applying the respective signals in the tow vehicle.

If you are installing a trailer side 7-way trailer connector then the missing wire is most likely for the reverse light circuit which will not be ran if reverse lights are not present on the trailer. When installing a 7-way trailer connector, I always recommend using a junction box like the one in the Trailer Wiring 7-Way Upgrade Kit part # HS381-9000 as it not only looks betters but also helps with troubleshooting.

expert reply by: Conner L

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Answer 1

What you have is an adapter that goes from a 7-way blade connector to a 6-way square connector. A few pop up trailer manufacturers used it but unfortunately replacements can be hard to find. In my opinion you would be better off cutting the 6-way off…

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Answer 2

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 3

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Answer 4

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 5

Traditionally, trailer manufacturers did not use electric brakes on boat trailers because the brake magnet wiring and trailer wiring did not always have the best insulation or water protection. These days, more and more manufacturers are using…

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Answer 6

Hey Richard, thanks for reaching out! The Dexter DX7.5 Drop-N-Go Brake Actuator #099-175-00 is a great option for a replacement actuator because it's a direct replacement for the common Model 60 actuators that were popular in the '90s.…

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Answer 7

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 8

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 9

Hey Jeremy, Typically with boat trailers the manufacturer will install hydraulic surge brakes because you don't have to worry about the water damaging wires like you would with electric brakes. That being said, if you use a heat shrink butt…

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Answer 10

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 11

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Answer 12

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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How To Wire a 7-Way Trailer Plug To A Vehicle With 6 Wires

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