I have a 1998 Ram 1500 with less than 98 thousand miles. I recently bought a 27 foot trailer and the stock mirrors would not allow me to see down the sides of the trailer. So I oped to replace the power and heated mirrors with a set of after market tow mirrors. the first problem i ran into was that on the drivers side, when mounting the top stud was too long and need to be shortened so that it would not hit the switch that activates the mirrors. But the big problem is that when the mirror harness was plugged into the truck harness the mirrors would not activate. the mirrors can be activated by using a small 12 volt battery but not when its plugged into the truck. So is there a fuse or some thing hidden some where under the dash?