Dodge 2004 HB Durango - Manual (Page 260)

The electrical connections are all complete to the vehicle
but you must mate the harness to a trailer connector.
Refer to the following illustrations.
Cooling System Tips—Trailer Towing
To reduce potential for engine and transmission over-
heating, take the following actions:
• City Driving
When stopped for short periods of time, put transmission
in neutral and increase engine idle speed.
4 - Pin Connector
7 - Pin Connector
260 STARTING AND OPERATING