It happens when you combine oxygen with copper. Put grease on your trailer plug, (just plain damn grease). (at night, when you step on the brakes, all the trailer lights go out) -see line one, above Trailer Plug Maintenance If your brake lights work, OR your marker lights work, but everything quits when you turn on both at the same time, your trailer is not grounded to the truck. the "brake light" works on the trailer, the truck just tells then when to flash or not. Still only one light on each side, so if your turn signals work, but not the brakes lights, it is your truck, not the trailer. It's just when they are "on but not flashing", it is assumed to mean brake light. Remember, Trailers DO NOT have "Brake" lights, they have only left and right turn. (add up your load, what could items run at once- example, all lights + brakes) Typically if you have 2 or more brake axles, lots of lights, and use the 12 volt AUX feed to power items, or charge a battery. 30 amps, for those extreme applications, bigger trailers or campers with big loads. 12 Ga, 20 amps, 3 axle brake wire, typical ground wire size, also, 12 volt AUX feed.14 Ga, 15 amps, Lights and up to 2 axle brakes (4 wheels, max).You can not have too many grounds! Make sure your ground wire (typically white) is securely attached to the frame on both the truck and trailer side, preferably at more than one location on the frame! The ground wire should be large enough to handle all the load, do not depend on grounding through the ball. We know everything about trailer parts and wiring, so we’re happy to help no matter what snarl of wires you’re faced with, or no matter how many outlets you need replaced.7 Way Wiring Diagram Other Notes About Trailer Wiring: We sell nation-wide, but our Texas hospitality comes through in every call. More Questions About 7-Way Trailer Light Wiring?Ĭall or contact The Trailer Parts Outlet. But go with 12 gauge for grounding, brake power, and battery hot lead wires. Generally, the smallest recommended size for a 7-way trailer plug is 16 gauge on turn signals, brake and reverse lights, and the running light wires. What Size Wiring for a 7-Way Wiring Harness Also, if you have some non-standard harness, you should definitely choose this option. That should help you figure out the intended function of each wire. You can always determine which wire is which using a circuit tester. Let’s say you bought a used trailer with tons of unlicensed DIY work. Trailer wiring is designed in accord with the practices of the Society of Automotive Engineers, or SAE.Ĭolor Coding for SAE Standard Trailer Light WiringĬolor Coding for RV Standard Lights Wiring The color coding on your harness is going to vary depending on whether you’ve got a trailer or an RV. Two Types of Wiring to Know: SAE Standard or RV Standard So grab a wiring kit, and some properly gauged wire, and let’s get to work. Let’s learn classic color coding for your trailer so you can get your lights shining again with minimal…sparks. You have a worn-out wire or some other electrical failing, and some savvy trailer knowledge or clever Googling on your part has taught you that you have 7-way trailer wiring.īut sadly, every wire is a different color, and you have no idea why.
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