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    SAVE 20% + GET A $10 GIFT CARD ON ONLINE SHIP TO HOME ORDERS OVER $100.

    Use Code: 20STACK10

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    Towing Guide Trailer Wire

    Trailer wiring harnesses use 4 to 7 wires to control basic lighting and brake functions.

    There's a standard color-coding for each of the 7 possible wires and their functions.

    TRAILER WIRING CODES

    The format shown to the left is the standard wiring format found on most vehicles and trailer wiring kits. If your trailer needs wiring, your best solution is to purchase a light kit that includes wires.

    4-WAY FLAT

    Most lighting kits use the common 4-way flat connector with three male ends and one female end. The connector is designed so that you cannot connect the plug backwards. This connector is mirrored on the vehicle side.

    • Turn Signals
    • Brake Lights
    • Tail Lights
    • Ground
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    5-WAY FLAT

    If your trailer includes backup lights, you can still use a standard wiring kit, but most vehicles that are wired for towing do not include a 5-way flat connection. You may need an adapter or to install extra wiring in your vehicle to support the extra light.

    • Turn Signals
    • Brakes Lights
    • Tail LIghts
    • Backup Lights
    • Ground
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    6-WAY POLE

    If your trailer includes back up lights and electric brakes, but is not wired for auxiliary power, then a 6-connect can be used.

    • Turn Signals
    • Brake Lights
    • Tail Lights
    • Backup Light
    • Electric Brakes
    • Ground
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    7-BLADE RV

    If your trailer includes back up lights, electric brakes and auxiliary power, then a 7-way connection is needed. The most common style today is the 7-Blade RV style which uses flat "blade" style pins instead of the traditional round connectors.

    • Turn Signals
    • Brake Lights
    • Tail Lights
    • Backup Light
    • Electric Brakes
    • Auxiliary Power
    • Ground
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