Parts Needed To Wire a Tandem Axle Trailer With a 7-Way and Full Length Ground Wires

Question

Question:

Hello! Im Resoring an old tilt trailer and will be rewiring in the next few days. I want to have every ground from lights and brakes to run back to my common ground wire that comes from my junction box as well as grounding that common ground to the main frame, and the tilt frame to the main frame on the trailer. Am i missing something or is this acceptable? I will be soldering and shrink wrapping all connections besides grounds to frame and Im trying to have as little points of failure in the form of ground screws and connectors as possible. Thanks in advance!

asked by: Bret B

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Expert Reply:

What you are looking to do is acceptable. Here are the parts I would use working on this type of project.

The 25 Ft 4-Way Trailer Wiring Harness # A25W2GWB has full length ground wires which will run down the side of each frame and carry the wiring for the tail lights and running lights. You will be able to cut off the 4-way and attach the wiring to a Junction Box # 3430001-JBK. The junction box includes ring terminals for connecting all the wires for the lights, brakes, and a 7-Way Cable # H20044. You will also need a Breakaway Kit # 3802346 to tie into the junction box. The Wire # 12-2-1 contains two 12 gauge wires allowing you to connect both the positive and ground wires for the brakes and run them both to the junction box. You will be able to splice these at each brake assembly and do not need to run 4 separate wires for each brake.

To make the job easier moving around the trailer we have the Cordless Soldering Iron # PTW2000 which runs on AA batteries. And we have 6" strips of Heat Shrink # DW05451 and # DW05449 to seal out the elements.

If you need help selecting any of the trailer lights or other parts you may need, please feel free to let me know what all you need.

expert reply by: Bud M

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Tandem Axle Tilt Trailer
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Answer 1

You are correct that Deka Jacketed 7-Wire #DW04914-1 uses 12-gauge conductors for all but the ground wire, which is 10-gauge. There are several variables with trailer brake wiring that we generally do not know when our customers ask about the wire…

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Answer 2

I have added an image below for the Bright Way Push-to-Test ICU Trailer Breakaway Kit #BW94FR as well as an installation video that is also very helpful. Here is where all the wires will connect from both the battery box and the breakaway switch.…

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Answer 3

As long as one of the wires coming from the back of the hub is a ground and the other is a power, it does not matter which wire on the magnet goes to which wire from the back of the hub. I have included a link to a video of a magnetic brake…

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Answer 4

The Bright Way Push-to-Test ICU Trailer Breakaway Kit BW94FR has actually been discontinued so the best Bright Way Group replacement for you is the Kit #3802308. I'm not sure what the mounting bolt pattern is for your 2327 but for the 3802308 the…

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Answer 5

It could be possible that your 2012 Boat trailer is wired with a wishbone style harness. Similar to Item #A25W2GWB. This type of harness just allows the installer to run each side separate rather than splicing and running extra wires across the…

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Answer 6

We have a replacement trailer side 4-way that has a 25 foot long harness with the part #A25W2GWB.

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Answer 7

The 25 Ft 4-Way Trailer Wiring Harness #A25W2GWB uses 18 gauge wire for the ground wires and 20 gauge wires for the light functions. The Wiring is copper and not aluminum.

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Answer 8

Typically 4-way wiring consists of 18 and 16 gauge wires. For a 4-way that has all 16 gauge wire you would want the Wesbar 4-Pole Flat Connector #W787264. The part #HM38138 uses 18 gauge for all wires but the white that uses 16 gauge.

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Answer 9

It sounds like your trailer had a wishbone harness and/or could have multiple ground wires. On a 4-Way trailer end, the one covered pin is the ground. Next to that is the running light pin. The running light pin on some connectors will have more than…

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Answer 10

You have 2 options for your 25 Ft 4-Way Trailer Wiring Harness #A25W2GWB when wiring in the Optronics LED Combination Trailer Tail Lights #TLL160RK. First is the way I recommend since the harness has the full length ground wires is to cut off the…

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Answer 11

Your 4-pin/5-wire wiring harness is what is called a "wishbone" type which simply means that there are two separate running light wires, one brown and one pink. This allows a separate running light wire for each side of the trailer which…

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