I need the wiring code for a 2008 grand caravan so I can install a trailer hitch. How can I get this info?

I also had the same problem with my 2008 grand caravan. It turned out to be a bad ground wire. A real difficult thing to find. You just might want to replace all of the wires or better still replace the entire harness it will save you a lot of trouble

some van don t have a ground wire. hook up to trailer put jumper cables to frame of trailer and van if works install a ground wire plug

Towing must be taken seriously and you must therefore make sure the correct towing accessories. A class 4 hitch cannot handle the massive weight of a horse trailer, it is therefore better if you didnt use it but used a class 5 hitch which can handle the loads.

check etrailer.com. they have a harness that connects to the taillights and even an installation video. the access and wiring are through the jack storage compartment on the drivers side.

Most likely the brown wire from the trailer connector is connected to a constant battery voltage source, and it should be connected to the vehicle running light circuit, however someone might have wired the trailer connector up that way on purpose so that the trailer does not draw power from the vehicle running lights and possibly damage the vehicle running light circuit. (Dodge/Chrysler vehicles do have delicate lighting systems) Here are some images to help assist you, and the 4 way connector is the same as the 5 way connector just without the blue wire for the trailer brakes.

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

that's because its to plug in for an electronic trailer brake controller

There should be a tail light connection behind the left light assembly, where the harness adapter plugs in.