It may be tricky for someone to help when there is an aftermarket alarm involved but if they aren't working from the switches either, the alarm is likely not the issue. Start by making sure there is power at the master switch on the drivers door. If you can borrow a switch panel from another truck and plug it in, that would be an easy way to eliminate that panel as the culprit first, they only take 1 or 2 minutes to swap.