Wiper Wiring

I'm new here... I've never owned a mustang before, but, my Son's 2001 Mustang GT is going to be residing at my house for the next couple years while he's cruising the Pacific in a submarine Upon leaving he said "oh yeah, dad, could ya get my mustang sorted out for me..."
The PO cut what appears to be all the wires to the wiper switch and replaced them with a mini switch that just turns the wipers on/off . Where can I find a schematic and/or wiring diagram of the windshield wiper circuit? I guessing that ther must be something wrong with the circuit (or PO wouldn;t have cut everything in his path) so how do you diagnoss it

Thanks,
Rod