You have a bad LCM (lighting Controle Module)... They are not cheap, but common to fail on these and Crown Victorias. Dealer part, usually runs $525.00 to $550.00
As per www.totalrecallinfo.com there are 4 recalls on this item, but not on the headlights.
The headlights do not have an external fuse. The underhood computer (FCM) has internal fusing for the headlights.
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis
You can find these headlights online, but aftermarket headlights still will cost you a pretty penny, if your grand prix has plastic headlights and it is just a matter of discoloration this could easily be fixed. Just go to the The Headlight Solution, at headlightsolution.net they specialize in restoring / cleaning headlights to like new condition.
No. Different shape.
25 feet.
I was looking at the 1996 Mercury Grand Marquis Owner Guide and it shows that you can change each of the ( 4 light bulbs for the 2 low beam and the 2 high beam headlights ) ( the low beam headlights take bulb # 9006 ) ( the high beam headlights take bulb # 9005 )
Externally, soapy water and a cloth.
like $20-30 bucks
use tools
Most headlights are not fused they are wired direct thru the headlight switch... Is your switch bad??
set e brake