headlight relay location on a 2004 mercury grand marquis
how to remove right turn signal relay on 1986 mercury grand marquis
The relay for a 99 Grand Marquis heater is located on the kick panel on the driver's side of the car. The relay is located under the kick panel cover.
The 1999 Mercury Grand Marquis air suspension relay switch can be found on the firewall in the engine compartment. The air suspension relay switch will be on the passenger side of the firewall.
Inside the front right and left fenders, just under the side marker light, I believe. If it doesn't work at all, check the relay first.
You have many relays in that vehicle, most are in the fuse and relay box under the hood.
Fuse or relay defective.
Check the operation of the cooling fan or fans. One should run constantly with the A/C on. If it does not, check the fuse, relay, and finally the fan itself.
the black box on the left side of the trunk
The relay for the headlights in a Mercury Grand Marquis is typically located in the under-hood fuse box. You can find the fuse box on the driver's side near the battery. The specific relay may vary by model year, so it's best to consult the vehicle's owner manual for the exact location and identification of the headlight relay.
it is on the firewall and difficult but not impossible to get to and replace.
Replace the flasher relay if none of them are working.