You are most welcome. This is my first winter wuth my GT but in comparing this winter to last year's where I live, it has been much colder this year. If the same holds for you then that may explain why you had no issues last year.
The owner's manual suggests that any charging be done in the engine compartment which I do. To the rear and on the left (as you face the windshield) is a red rubber cap which you can flip open under which you will find the positive teminal. Toward the front and to the left you will see a similar-sized nut (as the positive one) that is attached to the vehicle's body. That is your negative terminal.