This is probably a question that cant be answered but you dont know until you try. Is there a exploded veiw out there of a 85-87 vette that shows all chassis, engine, and battery grounds in prospective to the car. having a couple of electrical problems and want to rule out all possible grounding issues. hatch release wont work. have power running to the switch on one side and then it transfers to the other when the button is pressed in . the relay in the back has three prongs going to it. to of which have power and the third when it receives power pops the hatch. i pulled the plastic cover off of the relay and can pop the hatch by pressing the tab on the top of the relay to make the connection but it will not do it by itself. Also wipers are not getting any power. please let me know if anybody has any ideas. I would like to diagnos the problem before i spend 20 dollars on a relay i dont need. Thanks!