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

Since LED lights do not require a lot of amperage you can go with relatively small wire. Using 16 or 18 gauge wire will be fine. Harness #A20WB uses 20 gauge wire which is on the small side but certainly not a problem at all for LED lights even…

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Answer 3

Maximum amperage draw for 4 Brakes that are 10 or 12 inch diameter is 15.0 to 16.3 amps at 12 to 13 volts. The 14 gauge wire may be sufficient but for maximum braking effectiveness at full load capacity. I would opt to run 10 gauge wire. Larger…

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Answer 4

Most trailer wiring that runs to trailer lights is 16 gauge. I would rather people use 14 or 12 unless the lights are LED which draw considerably less. But for most people 16 gauge works just fine for basic trailer lighting. If you are planning on…

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Answer 5

I went to the warehouse and took a look at the Command Performance Double Tail Light, part #CE86FR. Each of these assemblies has 20 LEDs. With high illumination this assembly would have a draw around .17 amps and at low illumination that draw would…

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Answer 6

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 7

The Sealed Oval Trailer Stop, Turn and Tail Light, item #ST70RB, uses an 1157 automotive style bulb with two filaments. The bright filament is rated at 21 watts and the dim filament is rated at 5 to 6 watts. With the filament wattage, we can…

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Answer 8

For a 12,000 lb. electric car trailer winch like the Bulldog Winch Trailer Winch part #BDW10040, I recommend a standard 12 volt lead acid battery rated up to at least 650 cold cranking amps (CCA). As long as the battery is rated up to 650 CCA then…

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Answer 9

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 10

It's a wire color difference but not a function difference on the pins of the 7-way. The difference comes from the fact that the two different styles are representative of two different areas that uses trailers. Traditional is usually seen on…

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Answer 11

For the brake wire on your 7,000lb car hauler you will want to use a 12 Gauge Wire #12-1-1 for the power wire. The ground wire can either be grounded to the frame or you can use the Jacketed 2 Wire #12-2-1 if you are not using the frame as a ground.…

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Answer 12

You will actually just need kit #APT6SE-36 which is the same thing only the equalizers in it are 13-1/8 inches long. The hardware with each is specific to the kits so some of the other parts are different but for 2 inch slipper springs and 13-1/8…

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