i have a 2002 F250 4x4 that will not shift out of park unless the blower motor is truned on. My reverse lits are on all the time. Blower will not shut off with the key or the switch, when i turn the blower switch on the headlights come on... when i turn the headlight on with the headlight switch left headlight is dim....but when the blower switch is on then both headlights are fine....no codes or check engine lights. I need help asap.....what could this be?