Instructions for Completely Rewiring a 14 Foot Tandem Axle Dump Trailer

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Question:

We have a dump trailer and I was wondering if rewiring the trailer is something that is simple to do and what I would need. Thanks for the info. It is a double axle with magnetic brakes. I believe that it is a 7 way bladed plug. 14 feet long.

asked by: Matt

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Expert Reply:

Rewiring your 14 foot dump trailer is pretty straight forward. I would start with a 20 ft. Wishbone 4-Way Trailer Wiring Harness, # A20WB, to provide wiring for the stop turn and tail lights on your trailer. We have a video detailing how to install this type of harness for you to review, see link.

Next, I would use the RV-Style Trailer Connector, # PK12706, and remove the 4-Way connector from the 4-Way harness and install the wires in the proper locations in the 7-Way connector. Our wiring page, see link, has photos that detail the wiring configuration of the 7-Way RV trailer connector for you to review.

Next, you will need to wire the trailer brakes. I would use an appropriate length of the Double Bonded 10 gauge wire, # 10-2-1, and run wires from the trailer brake output terminal in the 7-Way connector, # 2, and the ground wire coming out of the 7-Way connector, to each brake magnet. Run the 10 gauge wires down one side of the trailer and T off to go to the brake magnets on the other side.

Next, run a 10 gauge wire from the 12 volt power terminal, # 4, in the 7-Way to the positive post of the battery that provides power for the hydraulic pump on your dump trailer. Make sure the battery is grounded to the trailer frame and that you have a ground wire attached to the trailer frame from the ground in the 7-Way connector. This wire will then help maintain the trailer mounted battery charge when the vehicle is running and the trailer is plugged in.

Finally, your dump trailer may have a breakaway kit installed. You will need to make sure the wiring for the breakaway is ran correctly for it to function properly. Since your trailer has a battery for the hydraulic pump, the battery may be utilized for the breakaway system also. I have added links to an installation video that shows a breakaway kit being installed, and a drawing that shows how a typical breakaway is wired.

To make the installation more professional looking and protect the wiring you may want to use some wire loom, # 459075-1, metal loom clamps, # A0500, and some ring terminals, # DW05705-1.

expert reply by: Robert G

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Answer 1

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 2

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Answer 3

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 4

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 5

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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Answer 6

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Answer 7

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Answer 8

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Answer 9

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

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Answer 10

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Answer 11

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Answer 12

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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Instructions for Completely Rewiring a 14 Foot Tandem Axle Dump Trailer

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