Rep Power: 0

Alright so here is what happened. I was driving down the highway a few days ago and the battery died while driving cause the car to shut off on me no matter how much i put the throttle to the floor. I replaced the battery about 16 months ago so i figured it was still good. I went ahead and bought a 100% new alternator and installed it, charged the battery. Everything seemed fine so i decided to take it out and it died after about 90 min of driving. I thought maybe my ground from the battery was bad so i went and replaced the terminal and wire and wet sanded the spot where the terminal wire mounts onto the engine and replaced the ground from the engine to the front frame. I am still having problems and it is quite frustrating. I took the car down to a local advance auto parts and they hooked a machine up to check my system. The reader came back with results saying that the battery was good and the alternator was good. It says i have a small drain tho, o.o2 A. I am running 2 amps to power my 4 12" subs in the car but have had them in the car for well over a year now and this is the first problem i have had. Both amps are connected directly to the battery with a fuse in the line. I am at a point where I dont know what to do. Any suggestions?