There is a reason for the ground wire location in trailer plugs, use it. Make sure the ground wire connection is good on the tow vehicle and install a good ground wire (clean connection point to bare metal and use a bit of anti-seize to slow rusting) to the trailer. Use 12 gauge or larger with electric brakes.
Your turn lights and brake lights use the same wire from the signal light switch back. If you had one and not the other, it would indicate the truck signal switch was bad and that would show up in the truck lights as well.
If you have steady (blinking with that side's turn signal on) power for the left signal/brake lights in the trailer junction box, it is not likely the plug connection. In the junction box, check directly on the wire going back to the lights, not just the stud to be sure it is not a bad connection.
At the back, did you check the power to the lights in the light socket or the wire ahead of the connection to the light? Even though still connected, connections can corrode and stop current passing through. Is there a break in the conduit, near the axles, where the brake wires connect? A junction box for the break wires near the axles? Any opening in the conduit is a possible location where the wires could be damaged.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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