It should be about $220, depending on where you are located.
They unscrew from the back of the light assy. You may have to remove the light to get ot it.
Check Chilton's Ford Escort/Tracer 1991-99 Repair Manual.
Its held in with 4 star shaped screws... just disconnect the headlight bulbs, remove the screws and install the same way that you took that out with.
how to replace waterpump on 1991 lincoln continental 3.8 L engine
You remove grill to remove and replace the headlights.
Open the hood and then unplug the bulb from the back and then you must take the screws off the top of the whole thing and voila..
behind right headlight
Where is the headlight relay for a 1991 mercury Capri
Typically this is a failure of the headlight switch assembly. See the question about how to replace the headlight switch in a 1991 Cherokee for the answer of how to accomplish.
If the lightbulb itself is burnt out on a 1991 Mercury Cougar then just replace the light. If it is the wiring that is the problem then find the burnt wires and cut them. Replace them with new wiring.
It is on the drivers side quarter panel right behind the headlight.