97 f150 automatic with 4x4 accessory problems.?

my dash is screw balled. when i turn on my headlights the turn signals stop working. it does the same when i try to turn on the blower motor for heat or air. but the blower motor doesnt work at all for some reason. my dash lights dont work unless i have the blower motor selected to on. when i have all accessories off my turn signals work. i just bought this truck and it sat for 6 months and the guy said it all worked when it was parked and his son tryed to give it a jump to get it started . i dont know if that messed things up. i checked under dash fuses and they were all fine. thanks if you can help. or where to start.