Ford Villager Owner's Manual page 247

Trailer Brakes
Separate trailer brakes are required on most trailers weighing
over 1,500 lbs. (680 kg).
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.
Trailer Lamps
Make sure your trailer lamps conform to federal and local
regulations.
Class I 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.
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.
Trailer Tow Module (If equipped)
The trailer tow module on your vehicle (if equipped) allows
turn/stop lamp control on a trailer being towed by your
vehicle.
The trailer tow package includes:
trail or tow module which draws power from the vehicle
stop lamp fuse
Driving Your Villager
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