CUSTOMER CONCERN The vehicle will not power up or start. The 12-volt battery tests good, but voltage is low at the underhood jump terminal. CAUSE The stud at No. 3 short connector A90/Y7 was loose, creating excessive resistance and a voltage drop between the 12-volt battery and underhood power distribution. CORRECTION Repair and secure the loose stud at No. 3 short connector A90/Y7, then verify full battery voltage at the underhood jump terminal and normal Ready-mode operatio