1996 Mercury Grand Marquis Owner's Manual - Page 196
1996 Mercury Grand Marquis Manual
Page 196 highlights
RWARNING Do not connect a trailer's hydraulic brake system directly to your vehicle's brake system. Your vehicle may not have enough braking power and your chances of having a collision greatly increase. Connecting the trailer's lights Do not connect a trailer's lighting system wiring directly to your vehicle's lighting system wiring. To get the proper equipment for hooking up your trailer's lights, see your local trailer dealer and your Ford dealer. Be sure to follow their instructions carefully. If your vehicle is equipped with the optional trailer tow package, the proper lamp wiring and equipment has been installed at the factory. The trailer feed wire (supplied in a box in the luggage compartment) needs a connector compatible with your trailer prior to installation. If you do not install trailer lights correctly, you may cause damage to the vehicle's lighting system. 193