Mercury marquis 2003 left signal light blinking fast

SOURCE: turn signals dont work brake lights dont work

You didn't mention your rear brake lights. If they don't work either then you probably have a bad light control module (LCM). This is a common problem with big Fords. You can buy a replacement part ($250) or have yours rebuilt (www.autoecu.com). The module is located under the dash to the right of the steering column and is fairly easy to replace.
Do the turn signals work? If not it may be the turn signal switch. The aftermarket parts are cheaper than a Ford factory part; check the guarantee before deciding.
Worse case scenario? You need both parts.

SOURCE: i ned to change left side marker light up front

I changed the front left marker light on side of headlight assembly by unscrewing the screw on the far back of it. then i just pulled it off. it felt like it was gonna break but it came off just fine

SOURCE: Right side turn signals don't work.

if bulbs okay check fuse is good you got faulty turn switch or bad ground.

Ronny Bennett Sr.

• 6988 Answers
• Posted on Jul 09, 2009

SOURCE: 2001 Mercury Cougar turn signal light bulb

3057 bulb

SOURCE: headlights constantly go on and off, all other

i had this problem on my 2004 and it was the headlight module when it gets hot it turns out, and comes back on when it cools off