Hi I have a 2002 tb lt.the other day I jump started my dad's truck and made a mistake of hooking up the jumper cables wrong negative to positive positive negative well it made it big spark and now my car electrical system is messed up the car still starts but the voltage on the dash is really low already got a brand new alternator and it was fine for a day or so and now it's messed up again does anyone know what I should do to find out what's wrong with it the battery is still good and I believe the alternator is too I just feel like there's something else wrong with the electrical