This chart also may not be accurate for vehicles with factory installed trailer harnesses. You may thing the rubber caps protect the plug but they tend to hold the water in. This allows you to deactivate the hydraulic surge brakes on your boat trailer when your vehicle is in reverse, so you can back up your trailer without locking the brakes. We recommend 16 gage and larger for lighting. Size: Use a wire size appropriate for the power demands. Possible live wire shorting to ground. The red and blue wire can be used for brake control or auxiliary.
This is usually related to one of two things. If you think changes might happen later, then leave access to the wires. Always check with your tow vehicles owners manual about adding additional loads to your electrical system. Check local ordinances for requirements. It is a little more work, but it can save big headaches later.
They often use bonded wires for a reliable connection and have rubber construction to protect against the elements. Simply locate your vehicle's wiring harness connector, located behind the tail lights. Protecting The Wires: Hollow frame members are often the route for wires. Trailer Wiring Diagram Notes: Wire Size Notes: Many different sizes of wires are available. Wire Routing Where do the wires go? The 5th pin, a blue wire, gives power to operate or disable the trailer brakes. By law, trailer lighting must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals and brake lights. Follow these guidelines and make it right! They can easily snag or get frayed.
Please note the 5th pin is not as standard as the first 4. Size: The Brown wire only feeds power to lights, so size it for the power requirements of your lights. This new connector is a 7-blade and 4-pin combination so you can tow with either. Make sure you check out our selection of brake controllers and choose the one that meets your needs before you hit the road. This is not shown in the trailer wiring diagram above. Better yet, use a purple wire and label it. So, if you step on the brakes and all the trailer lights go out, then you need to ground your trailer to your truck with the ground wire.
A thin coat of grease will help prevent copper oxide from building up. This is the style we recommend. See our , , , and. This is going to make this job so much easier. We manufacture T-Connectors, wiring converters, wiring connectors, adapters, brake controls and more to make towing safe for you and the drivers around you. Note: The black sometimes red 12v and blue electric brakes wire may need to be reversed to suit the trailer.
For lights, a relatively small wire gage works. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. About the Author Jack Hathcoat has been a technical writer since 1974. Their ease of operation and innovative design features make them the perfect choices for your towing needs. The male end is mounted on the vehicle side and the female on the trailer side.
Use the 7-pin connector anyway see below , and just leave out the last 2 wires. The orange and blue wires are in a separate bundle taped to the wire harness that runs down the frame on the drivers side. It works because the trailer is not big or heavy — and with a light load it does not require brakes. The 5-Pin flat connector above is nice for easy handling, but if your vehicle already has a 7-pin, just use it. All trailer wiring and the tow vehicle connector should be checked and tested. Typically the 5-Way Flat is used for trailers with surge brakes or hydraulic brakes.
Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Safety defects must be repaired by a dealer at no cost to you. The Hopkins connector snaps in to the bracket, and the Pollak harness plugs in to the back of it. A white wire may also be found in that bundle, it is a brake light wire which is not normally used for trailer wiring. This is done in one of two ways. If you have this type of wiring a converter is required.