Four problems related to turn signal have been reported for the 2003 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mercury Grand Marquis based on all problems reported for the 2003 Grand Marquis.
Headlamps turned off while driving down dark highway at night!!! only able to make high beam lamps work by pulling turn signal lever back and holding in that position. Low beam and high beam do not work, only high beam when manually held on. Should be recalled!!! very dangerous!!!.
Turned on headlights they did not come on but if you pull back on turn signal high beam works when held in position.
2003 Mercury Grand Marquis. . This is a loaner car while my f-150 was in the shop. I used the car for work that morning. Lights worked fine,but I needed to use my trailor the next day so my wife was going to use the car for work the next day so I could use our explorer to pull the trailor. The car needed gas and it was dark out. We went to go for gas and when I started it the parking lights worked but the headlights would not. I pushed the turn signal lever forward and the brights didn't either. I checked the fuses and could not find one bad. It is going back to the Ford dealership. I would think from what I have read about this being an ongoing problem, there would of been a recall by now. I'm just glad it didn't happen to my wife on her way to work,it was foggy and dark that morning.
I own a 2003 Mercury Grand Marquis and the headlights will randomly decide to work or not work. Most times they work for 3-5 minutes and then just go out. . The running lights and turn signals still work. The only way to see is to manually hold the high beam light in position while driving.