Trailer light hookup missing wires there dont know what color goes where 2002silverado

first ck under and see if connector for trailer is there. if so use it,test each wire with test light to see whats what. or pull lt taillamp and trace wires back and splice in .

if you have a test light then check for voltage at the wire that only has voltage when the brake is applied that is the wire that your looking for.don`t remember the color.

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Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4 way tow vehicle side.
4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5 way tow vehicle side.
5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6 way tow vehicle side.
6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.

6 way tow vehicle side.
6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.

7 way RV flat blade tow vehicle side.
7 way RV flat blade trailer side.

The 4 prong plug will have 5 wires attached to it.
The white wire is the ground and is attached to the trailer frame near the front. There will be two brown wires and one goes down each side of the trailer. These wires will have a connection at the side marker lights near the front of the fenders. They will then continue to the tail lights. The light bar in the center is also connected to the brown wire.
The yellow wire at the plug is for the left stoplight and the green is for the right stoplight. One of the wires out of the taillights will be brown and the other wire will not match the color of the harness wire.

The rear lights :

Brown is the parking lamps ( either side )

Driver's side Stop / Turn : Light green w/ White stripe wire
Pass Side Stop / Turn : White w/ Light blue stripe wire

Another option ( for use with the factory trailer circuits ) is to add / replace the factory tow adapter. eTrailer has them, if you are interested. This is the type adapter as Ford p/n: YL3Z-13A576-G. You would need to install the relay and the fuses for the trailer circuits if you do this.

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).brownwire will run both right and left side markers

red is aux black is ground yellow is left turn brown is right turn blue is electric braking if its a seven pin connector you can look on the front cover and it tells you where the wires go.

Try this Link www.dodgeram.org/tech/mods/electric/trailer_wire.htm

You will need a test light, don't worry about the colors. Four wires, one for left turn signal, one for right turn signal, one for parking lights, and one is ground(usually black). Hook up ground, turn on trucks left signal and hookup to one of trailers other three wires, you will either light up the correct light or wrong one just continue til lights match coming off your truck to what you want to light up. And brake lights are left and right signal, so if you do signals the brake light will work. I can explain further if you need help.

Are you putting on a 4 wire flat connector? Trailer Wiring

4 Flat Small
Brown = Tail Lights
Green = Right Turn Signal & Brake Light
White = Ground
Yellow = Left Turn Signal & Brake Light