2002 Dodge Ram 1500 lighting problems

1.sparks from dashboard area near headlight switch were seen by my wife when she borrowed the vehicle. 2.now the headlights will not turn off, when the switch is turned to the off position the fog lights come on, head lights also will not completely come on.3. So far, $49 dianostic, switch needed (had to be special ordered b/c the part has been changed three times already)(doesn't that constitute a recall?)anyway it is going to cost me $79 for the new switch and they are not even sure that will fix the problem.

Our dodge ram 1500 was working fine one day the next day the headlights, turn signals, and brake lights were not functioning. We checked fuses and anything else obvious. The next day we took it to a mechanic, after half a day of checking he found that the fuse and relay center (integrated power module) which is located under the hood was corroded. This box is not air tight and allows water to get inside and corrode the insides.