65 falcon weird issue
Hello I have a 65 2 door falcon, did an engine swap to a 302 5.0. Engine rebuilt and alternator, battery, starter, ignitions switch arte all new. Problem is I trickle charge the red top battery and the car fires right up at home everytime, but after driving it, it gets harder and harder to turn everytime I turn it off, to the point that it wont turn and has to be jumped. Had battery and alternator checked (autozone), they said the alternator was good and the battery was 100% but it wouldnt start unless I jumped it with a portable jumper, car sounded like the battery was dead. My car has a new starter solenoid but the wire coming from the key ignition switch looks pretty thin, its original, not sure if that could be the culprit. Any ideas?