02 Envoy Slt Battery Draw

I Was Having Having Problems With My Battery Draining, The Dealership Had The Car And After 5 Or So Trips Back, They Replaced The Hvac Control Module, About 10 Months Ago, I Started Having This Problem Again And Was Going To Replace The Hvac Control Module Myself, But It Still Costs 550 Dollars. So I Took My Meter And Started Pulling Fuses To See If I Could Isolate The Draw, Now Ther Was A Draw From The Hvac Fuse Under Rear Passenger Seat But A Much Larger One From The Radio Fuse And The Fuse Labeled Amp, Which I Think Is The Factory Amp. Also Every Time I Turn The Ignition, The Cd Player Cycles Through The In Dash Stereo,(the Bose Factory).i Love The Car And Wanted To Know If I Could Get Some Insight So I Can Drive Again?