My 2000 Mountaineer has a delayed headlight shut off switch located on the bottom of the rear view mirror. It slides right or left. To the left is off and as you slide it to the right the delay feature gets longer. Farthest to the right could very well be around ten minutes.
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.
30 minutes before sunset
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
30 Minutes before sunset
it takes about 3-4 minutes for light to travel to mercury
Mercury
Legally (at least in Missouri) headlights are required 30 minutes before sundown until 30 minutes aftersunrise.
Approx 253,300 minutes.