1996 Ford Ranger Owner's Manual - Page 215

Driving Your Ranger Trailer Lamps Make sure your trailer lamps conform to Federal and local regulations. Class I and Class II Trailer Tow electrical wiring provides two circuits (right hand and left hand) to operate trailer stop/turn tail lamps. Each stop/turn circuit will operate one combination stop/turn light bulb (# 1157, 3157, 2357, or 3357) on the trailer. Never add more than one trailer light bulb to one circuit. RWARNING Always replace a fuse with one that has the specified amperage rating. Using a fuse with a higher amperage rating can cause severe wire damage and could start a fire. Driving while you tow Be especially careful when driving while you tow a trailer. Never drive faster than 45 mph (70 km/h) when you tow in hilly country on hot days. Also, anticipate stops so that you can brake gradually. If you use the speed control while you are towing on very long, steep grades, the speed control may shut off. When towing a trailer in hilly terrain, with a vehicle equipped with a 4R44E/4R55E transmission, you may wish to operate in O/D OFF (3rd gear) rather than j (Overdrive). This will eliminate excessive downshifting and upshifting to maintain speed. Shift back to j (Overdrive) whenever practical for optimum powertrain cooling and fuel economy. This can be accomplished by pushing in the transmission control switch which is located on the end of the gearshift lever. 215