It has a built in timer. You can adjust how long they stay on with the sliding lever located on the rear view mirror.
I had to take my mountaineer to a mercury dealer and it took them about 5 minutes. They connected my car to a computer and the computer gave them the code. Its been working ever since they also showed me how to change it if I wanted. Try that!
Unhooking the battery for about 20 minutes should be more than enough to resed the computer.
30 minutes after sunset
Headlights are required to be turned on in Tennessee 30 minutes after sunset to 30 minutes before sunrise, when visibility it low, and in adverse weather conditions.
Hey Fred==Your car probably has auto headlights and has a module under the dash to control them. The module is bad. goodluckJoe How long do they stay on? They're supposed to stay on for about 3 to 5 minutes.
30 minutes before sunset
30 Minutes before sunset
Headlights should be on at least 30 minutes after sunset and can be off 30 minutes before sunrise. They should also be on during times of limited visibility, such as in rain or when it is snowing.
Easiest way is to disconnect the battery cable (negative) for a couple of minutes, then reconnect. This clears the computer. If everything is OK, Check Engine will stay off.
It depends on the model radio you have, you can Google 1999 owners manuals for your truck and download a free pdf. But 97-2000 had numerous probs w/ radio. For most models you hold down the clock button or RDS button for a couple seconds then use the seek button till you get to hours the push the button again till you get to minutes. Alot easier to go here 1999 mercury mountaineer owners manual pdf
it takes about 3-4 minutes for light to travel to mercury