(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. 7 Way Wiring Diagram Other Notes About Trailer Wiring:
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