Your Mercury Grand Marquis Tail Light assembly actually has four functions to fulfill. At night - and on dark, rainy, snowy or foggy days - it is a beacon, warning drivers behind you that you are present, ahead of them on the road. When slowing to a stop, a brighter red light signals a warning to the people in your rear that they had better do likewise.

When flashing individually, these brighter red reds indicate your intention as to which way you're planning to turn, or as a courtesy to other drivers, let them know that you're planning to switch lanes. When flashing together, they serve as a warning to other drivers of a potentially hazardous situation - either you're having to travel at an unusually slow speed, or your vehicle is incapacitated or disabled.

In any event, a working tail light assembly is an absolute necessity, both for your own safety and in order to keep your vehicle street-legal and road-worthy. Fortunately, when you shop with us, this is easy and inexpensive to do.

We are able to guarantee the lowest prices on any Mercury part or accessory you may need, because we will meet or beat any competitor's online advertised price. In addition, when your order totals $50 or more, your shipping is free! So, when you order your Mercury Grand Marquis Tail Light from us, consider getting some items for your car's emergency kit - spare belts and hoses are always good things to have with you.Order conveniently online with our SSL-encrypted server, which keeps your private payment information safe and secure - or call us toll-free, anytime of day or night - customer reps are standing by!