All You Ever Wanted to Know about 7 Way Trailer Plugs 7 Way Blade Trailer End Plug 7 Way Blade Truck End Plug Wiring Code Common 7 way Connector Function Usual Trailer Wire White Wire Ground White Wire Red Wire Left Turn and Brake Yellow Wire Brown Wire Right Turn and Brake Green Wire Green Wire Tail Lights Brown Wire Blue Wire Brake Power Blue Wire Black Wire 12 volt (hot lead) Black Wire Yellow Wire Aux. - To confuse matters worse, TYPICAL trailer wire colors are below. IF (and I say IF) your trailer uses the standard wire colors, then you will need to match the FUNCTION, not the color! White = Ground 12 volt Negative Black = Aux 12 volt Pos. (sometimes not used... sometime red... sometimes if you have no white on trailer, this may be the ground wire) Green = Right Stop/Turn Yellow = Left Stop/Turn Brown = Tail Marker lights Blue = Electric Brakes (Sometimes this will be black wire in a double wire cord with the white) (So, For example, the red "plug" wire will connect to the Yellow "trailer" wire = Left stop/turn) Trailers normally don't have back up lights, if they do, there is not "standard" color-- The reverse light is the CENTER pin on the plug!) # Color Gauge Circuit Function Truck/Car End Connector Interior 1 White 10 Common Ground 2 Blue 12 Electric Brakes 3 Green 14 Tail/Running Lights 4 Black 10 Battery Charge (+) 5 Red 14 Left Turn/Stop 6 Brown 14 Right Turn/Stop 7 Yellow 14 Auxiliary/ Backup NOTE: #7 is the center terminal and currently is most commonly used for backup lights. # Color Gauge Circuit Function Trailer Connector Interior 1 White 10 Common Ground 2 Blue 12 Electric Brakes 3 Green 14 Tail/Running Lights 4 Black 10 Battery Charge (+) 5 Red 14 Left Turn/Stop 6 Brown 14 Right Turn/Stop 7 Yellow 14 Auxiliary/ Backup NOTE: #7 is the center terminal and currently is most commonly used for backup lights. Dual Purpose Bulb System Wire Function Wire Color GMC Ford Chrysler Jeep Toyota Honda Mazda Right Turn & Brake Lights Green Green Orange w/ Blue Stripe Brown Brown Green w/ Yellow Stripe Green w/ Yellow Stripe Green w/ Yellow Stripe Left Turn & Brake Lights Yellow Yellow Lt Green Orange Stripe Dk Green Grey w/ Black Stripe Green w/ Black Stripe Green w/ Blue Stripe Black Stripe Tail Lights Brown Brown Brown Black w/ Yellow Stripe or Black Blue Red w/ Green Red w/ Black Stripe Green or Black Stripe Ground White Black Black or Grey Black Black & Black Black or White Black Black Single Purpose Bulb System Brake Lights Use Converter Pink or Lt Blue Red w/ Green Stripe White Blue w/ Black Stripe Green w/ Red or White Stripe Green w/ White Stripe Green or Green w/ Red Stripe Backup Lights Red Lt Green Black w/ Pink Violet Brown - - - Electric Trailer Brakes Connect To Blue Wire From Brake Controller 7 Way Wiring Diagram (Click for a Bigger Image) Other Notes About Trailer Wiring: 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. Wire Size: - 16 Ga, 10amps, Lights only - 14 Ga, 15 amps, Lights and up to 2 axle brakes (4 wheels, max) - 12 Ga, 20 amps, 3 axle brake wire, typical ground wire size, also, 12 volt AUX feed - 10 Ga. 30 amps, for those extreme applications, bigger trailers or campers with big loads. 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.... (add up your load, what could items run at once- example, all lights + brakes) Remember, Trailers DO NOT have "Brake" lights, they have only left and right turn. It's just when they are "on but not flashing", it is assumed to mean brake light. 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.... the "brake light" works on the trailer, the truck just tells then when to flash or not. 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. Period. (at night, when you step on the brakes, all the trailer lights go out) ---see line one, above Trailer Plug Maintenance Put grease on your trailer plug, (just plain damn grease). That green junk is copper oxide. It happens when you combine oxygen with copper. All you need is a thin layer of anything (and grease is cheap and sticky) to keep the oxygen (from the air or water) from getting to the copper. The rubber caps just hold the water in... Still Have More Questions? Email Paul!

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