Recommended Gauge of Wiring for Trailer Lights

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Question:

I am building a tiny house on a trailer that is 10foot x 35. I am a little confused about the lighting requirements. It seems that I can put one assembly in the middle of the trailer, on the rear, and then some lights on the side of the trailer, at their widest points. is that correct? What gauge of wire do I need? I am going to buy the components separately because there is not enough wiring in your kits for such a long trailer.

asked by: Tom

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Expert Reply:

Trailer wiring generally uses 16 gauge wire, part # 16-1-1. However, with a long trailer like yours you may want to go with a larger like 14 gauge # DW07550-1 or even 12 gauge # 12-1-1.

Each size is sold by the foot.

You will need to have the lights at the rear of the trailer of brakes and turn signals. Also since the trailer will be 10 feet wide you need clearance lights on each side.

expert reply by: Charles S

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Answer 1

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 2

When installing the MaxxFan Roof Vent #MA00A04301K that you referenced you will want to use butyl tape on the vent edges in addition to the sealant that you will apply around the unit to cover up bolt holes and any other areas that might lead to a…

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Answer 3

The batteries should indeed be grounded to the trailer frame. A battery disconnect switch like #277-000096 would install inline on the positive circuit of the battery as shown in the video I've linked for you.

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Answer 4

To replace your Ventline V2094 trailer vent fan, use the following: - Ventline Ventadome Trailer Roof Vent w/ 12V Fan #V2094SP-30 This includes a garnish which fits roofs 1-7/8" to 3" thick, but if you have a roof with a different thickness…

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Answer 5

It really just depends on where you want it. I would say most have the vent in the living room area of the trailer but if you wanted one in the sleeping area you certainly could do that as well.

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Answer 6

Yes, you can but please keep in mind that this is not the most efficient way for charging a depleted battery. However, for maintaining a charge on a battery while you are driving you can use the 7-way connection such as the Optronics 7-way, #A7WCB…

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Answer 7

When installing marker lights we recommend using 18 gauge wire like #SWC97FR. This is stranded wire and is what we typically use when wiring marker lights like the #MCL32ABB for example. LED marker lights pull very low amperage so 18 gauge is likely…

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Answer 8

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…

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Answer 9

RV roof vents are typically all 14" x 14" and require a 14-1/4" x 14-1/4" hole to install. Manufacturers have started prepping enclosed trailers with frame work to support a vent installation but I can't confirm whether or not…

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Answer 10

We don't have the 72 inch version but for a longer option we do have the part #HM38136 which is 25 foot long and could be cut down shorter if needed.

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Answer 11

Hi Robert! We have a couple options for a 25' long 4 flat. Our site can be weird sometimes, but not sure why it isn't showing you more options. Anyway, the Mighty Cord 4-Way Flat Trailer Connector - Wishbone Style - Trailer End - 25' Long…

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Answer 12

Aluminum trailer frames or bodies can cause grounding issues so I suggest using a separate ground wire that runs from the rear of the trailer up to the main ground post in the junction box like #38656. You can join the ground wires for the individual…

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Recommended Gauge of Wiring for Trailer Lights

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