I've checked ground it seems to be OK.
There's a few ways to check the trailer lights and wiring. You can check with a volt meter (or test light), at the bulb contact point. Is there 12 volts? If not, work your way down the wire toward the harness plug pins. While your in there, see if the bulb is blown. If on the roadside, or just not near a voltmeter (or test light), see if you can swap wires at the trailer harness plug. Sometimes they disconnect easily. Swap a wire with the brake lights' wire. Do those other lights work when you push the brake pedal?
110 views
Usually answered in minutes!
×