Well I had to go and jump my wifes 74 Mav. a couple days ago. It was very cold. I jumped it and started,on way home stop at gas station and it would not start or jump again. I pulled the battery and it checked ok. I have nothing, no lights no buzzer nothing. I am going to check it out tomorrow, thought I would post on here and see what you guys thought. My thoughts bad ground,starter or selinoid(sp).
Check the fuse links that go on the battery cable side of the solenoid. Try wiggling around the main harness plug by the master cylinder. Cold makes these lose connection.
Thanks I will check those.. I see you are in Florida,how cold did it get there? -16 here without windchill.