2005 2500HD battery charge for trailer

check out the video

https://www.google.com/search?q=2006+Land+Rover+Sport+so+I+can+hook+up+a+pigtail+for+trailer+lights

and also

https://www.google.com/search?q=2006+range+rover+sport+trailer+wiring+harness

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Sidelight, break light, turn signal. You can use a test meter to identify.

What is the color code for trailer wiring? On a 4-Way flat trailer wiring harness, white is the ground, brown is running lights, yellow is left turn signal and green is right turn signal.

Standard Color Code for Wiring Simple 4 Wire Trailer Lighting ...

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Hello Dewey, I can think of three reasons that could cause your problem. The truck pigtail is improperly wired, the trailer pigtail is improperly wired, or the trailer wires are contacting each other that they shouldn't.

is trailer lite fixture grounded good try and wiggle fixture when u hit signal. next try wiggle pig tail on trailer , still no signal. it must be wire from truck, trace back to connection and check all splices. to see if signal light works on trailer unhook pigtail and get a battery charger or another battery, connect a jumper from positive side to signal spot on trailer hook up. hook up ground as well see if light works if not its in the truck for sure.

Try this site. http://www.etrailer.com/faq-wiring.aspx. They give color codes and detailed info.
Check your owners manual as there should be a fuse under the hood to feed the trailer 12V trailer feed. On certain vehicles, the feed is controlled by the ignition switch. It won't charge unless the switch is on.

Might want to bench test the trailer tow battery charge relay.

You can also jumper this with a wire in the relay socket, to test the wiring to the trailer tow adapter. This is relay R05

You can either go to an autoparts store and buy the kit for like $40 or you can get a wiring diagram and splice your own pigtail in

1. connect the red wire to the stop lamp switch lead on the brake control. Connect the other end of red wire to the stop lamp switch in the vehicle using the splice connector

2. connect the blue wire to the trailer brake lead on the brake control. Route the other end of the blue wire to the trailer connector at the back of the vehicle.

3. connect the white wire to the ground lead on the brake control. Route the other end of the white
wire to the vehicle’s battery. Use the ring connector to connect the white wire to the battery’s negative terminal.

4. connect the black wire to the power lead on the brake control. Route the other end of the black wire to the vehicle’s battery. Use the fuse assembly to connect the black wire to the battery’s positive terminal.

You'll need to disconnect the wires from either the truck connector or the trailer connector...
I highly suggest purchasing a voltage checker- it looks like a screwdriver with a pigtail of wire with an alligator clip on the end. The tip of the 'screwdriver' has a point for probing. The light in the probe will light up...makes it easy to trouble shoot without a helper behind the trailer.
Hook the aligator clip to a good positive grounding point on the bumper or frame(not painted).
then pin by pin on the truck connection, stick the probe on each terminal tab.. and write a simple diagram where you find brake, tail, backup, etc...
Then i'd suggest, taking the connector off of your trailer, exposing the wire ends.
Run again thru your diagram and turn on each light of the truck. As you do, touch the wires from the trailer to that specific terminal. (make sure your ground wire is attached on the trailer) you can mark each wire with a piece of tape and label it which is which.
then simply attach your trailer wires according to your diagram to the terminals in the connector... that should get you in business..
hope that makes sense...
That way if the factory wiring harness remains the same, you'll be able to use it with other trailers if the need arises..

try http://www.etrailer.com/faq-wiring.aspx. This should help. Mike