2004 Chevrolet Malibu car problems

My alternator is on 2 or 3 yrs old. My battery is about a year or two. My uncle made me a wire that goes from alternator to battery. My battery turned absinthe morning but once I got off work it would start just went dead. Once I got jumped it turned on quickly. Drove home for about 45 min. Once I turned off my car it won't start. Battery dead.