The Ford Freestar van can tow a medium-size utility or camping trailer. The 2005 model year is rated for a maximum towing capacity of 3,500 pounds when properly equipped. All trailers are required by law to have brake, signal and marker lights in order to be towed on public roads. These taillight systems are connected to the tow vehicle by means of a four-pole wiring harness, and you can install this harness yourself. Trailer laws vary by state, so refer to the Resource section below for laws governing your area.
Park the vehicle on a flat surface and apply the parking brake.
Slide under the rear of the Freestar and look between the spare tire and the bumper for the wiring harness.
Remove the cap from the harness by prying the lock with a flat-head screwdriver and pulling it off with your fingers.
Install the wiring kit harness to this connection by pushing the two together until the locking mechanism engages.
Route the four-pole harness to the trailer hitch and secure with a cable tie.
Open the hood of the van. locate the fuse panel and remove the cover from its case.
Insert the supplied relays into locations "29", "30" and "31". Install the 20-amp fuses into locations "46" and "52".
