They are controlled electronically with a photocell, usually located in the rear view mirror. Some aren't. Why would you want to turn them off?? They will not come on if you use the light switch in the parking light position.
I just bought an '04 with auto tranny in a standard cab truck. Since I have always owned GM trucks, how is the 4.6L on dependability and how is the auto tranny dependability? I will be towing a 21ft Glastron ski boat with it and the weight is about 2600lbs.
Anything I should look for as far as...