No trailer Brake Lights right or left side

Color for each pin in the plug is stamped along side of each pin. This will get you hooked up. I can tell you that green wire is right turn and brake light, yellow is left turn and brake light, brown is running lights and marker lights, white is ground-frame to frame. This 4 wire plug colors and same on a 7 pin plug. It's universal standard. The other wires are for trailer battery charging from vehicle, emergency braking for dis-connect, and to the control box under dash.

there will be only 1 power wire for the brake lights as they are connected .together. What you are looking at are the indicator lights (1 left wire and 1 right wire)

Usually one of the holes in the marker light where screw goes in, has metal contact where screw meets light, but if not, and they are not push in wire connection type from behind, then just run your white wire up through hole in housing, and bare the end & tighten it up under screw holding light to body. White should be ground, brown should be power.

Usually one of the holes in the marker light where screw goes in, has metal contact where screw meets light, but if not, and they are not push in wire connection type from behind, then just run your white wire up through hole in housing, and bare the end & tighten it up under screw holding light to body. White should be ground, brown should be power.

Not sure if you know that much about electrical wiring so I will go through it like you don't.
Take the trailer plug out of the female socket at the rear of the car, turn your running lights on, go to the female plug and using a test light check to see which one lights up the test light, that wire will be the running lights wire.
turn the running lights off and turn either your left or right indicator on and check at the plug to see which wire lights the tester, do this for the opposite indicator as well.
Turn the indicator off and get someone to hold their foot on the brake while you test the plug for power.
check the male plug at the rear wire terminals by putting it in the female plug and perform the same test as the female plug, if you have power to all the wires at the rear of the male plug go to the lights at the rear of the trailer and perform the same tests as before.
to get the both rear brake lights to come on you have to run a red wire from the brake light on the live wire side to the light on the opposite side to give it power when you apply the brakes for it to light up.
Turn the ignition on and turn your left or right indicator on again and check the wire for that side, if that is ok do the same for the other side then the running lights, you will have to run another wire off the running light wire to the opposite side of the trailer to give that side power to the lights
ther should be an earth wire from the plug that has to earth the trailer, all the lights also have to be earthed as they will not work if they aren't.
Try that and see how you go, if you do it right they should work for you

White is ground, black is power to trailer battery trickle charge, blue is brakes, green is tail/running lights, red is left turn signal and left brake light, brown is right turn signal and right brake light, yellow is aux power/back up lights. This is the general color coding, there are exceptions, white, black, and blue are pretty much always as listed above, sometimes the others vary. If you find you are having trouble, post any further questions here, I'll be glad to help out. Curt

Do u have a 4,5,6,or 7 way (wire) system? If it's 4 way it allows basic hookup for 3 lighting functions:
GREEN is right turn signal and stop light, YELLOW is left turn signal and stop light, BROWN is license, and side marker lights, WHITE is ground.

5way is same as above, but adds a BLUE wire for brake signal or aux. power. Its used on pop up campers, utility and boat trailers.

6way (rectangle plug) green=right turn signal, yellow=left turn signal, brown=taillight, white=ground, red and blue can be used for brake control or auxilary. Used on small motorcycle trailers, snowmobile trailers, utility trailers.

6way Round Plug, same as above, but blue is electric brakes, and black (sometimes red,) 12v; note:sometimes red/black need to be reversed w/ blue to suit the trailer.

7way adds an additional pin at plug in for 12volt power or back up lights. Whoa! hope that answers your question w/out confusing u. Let me know if u need more info.