What color wires do what on my 99 Ram 1500's trailer wiring harness?

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Your truck may have had the factory trailer tow package, but that did not come with a wiring connector in that year. There should be a wire harness under the rear of the truck near the center of the bumper with 7 wires of the following colors/characteristics -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Tail Markers (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
Violet/Black - Backup Lights (Thin Wire)
Dark Green/Red - Left Stop/Turn - (Thin Wire)
Brown/Red - Right Stop/Turn - (Thin Wire)
Black - Ground - (Thick Wire)



Under the dash, the brake controller wiring should be -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Ground - (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
White/Tan - Brake Light sense - (Thin Wire)

Hope this helps.

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.

tail wire is brown.
signal/brake is yellow on left and dark green on right
ground is black

OK?

If you adding a trailer light harness, you can buy a seperate harness from most auto parts stores that will plug right in. There should be a connector near the rear of the truck that you can unplug, and add the trailer harness. It's simple and fast and you don't end up making a mess of your wiring. I suggest puting some "dielectric grease" on the connections to prevent corrosion.
Flat 4 connector.
Brown is tail lights and marker lights.
Yellow and Green are turn and stop. I think yellow is left.
White is ground.

Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. With the tow package, there should be a plug under the dash... far left above the emerg. brake petal. The harness that plugs into it should have came with the truck, or you can order one to fit it. Did thew truck come with a 7 pin plug on the back? If not you can order one from the above mentioned site. They also have the wiring colors.

Check the trailer connector for loose or corroded wires that come into the back of it. If the light works on the truck then you have problems with the trailer harness.

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