I am using a schumacher battery cahrger/ starter model no SF-1252-MA. I am using the 10 a setting and is on conventional mode.. How long will it take to charge battery enough to start it up?? I need to be somewhere in3 hours. is this going to be enough time?? I also plugged in my heater core thats never been used before. My car is a 1992 grand marquis LS. I hear no noises coming from it.. It has never been used. How do i know that it is actually working?? How can I tell??

Electrical Supplies - Schumacher - & Fast Charge Starter Charger