Purpose of Trailer Junction Box

Question

Question:

Hello I’m looking to have a more organized setup for working on a trailer. At this moment there is a battery that everything is hooked into. Would the junction box just be a replacement for the battery ?

asked by: Richie

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Expert Reply:

The # 38656 Junction Box won't take the place of a trailer mounted battery, but it provides a protected and organized method of connecting the wires from the trailer connector pigtail to all the various lighting, power and brake circuits on the trailer. If you watch the linked video, you can see exactly how they're used.

expert reply by: Mike L

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Answer 1

The only sort of protection we offer for wire leads such as those on the 25 Ft 5-Way Trailer Wiring Harness part #A25W5B would be wire loom, the 3/8" Diameter Wire Loom part #39035. This can be used to cover the length of wire on the tongue or…

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Answer 2

The short answer to both of your questions is yes. You can remove the backing plate or brake assembly and use the existing hub with integrated drum by itself, or, you can simply replace it with an idler hub. Based on the photos, I would suggest…

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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

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 5

If your trailer has 7 wires running all the way back to the brakes, then yes, you can tap into the existing wiring. Each of your new brakes will have two wires for the brake magnet. One wire is for 12 volt power to the brake magnets and the other…

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Answer 6

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 7

The auxiliary 12-volt wire that runs from the 7-way connection to 7-way trailer plug will supply 12-volt power from the vehicle to the trailer. The 12 -volt power will allow interior or exterior lights to run that are not wired in to the…

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Answer 8

As it seems you already know, when installing a trailer brake controller on your 2007 GMC Yukon you will need to locate the two wires under the hood that need to be connected to fully activate the vehicle's tow package. One is the power wire to…

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Purpose of Trailer Junction Box

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