1996 Geo Prizm 3.5 amp drain on battery

I've placed an amp meter between the battery terminal and connector I'm measuring a 3.5 amp drain. While connected I began pulling fuses to see where the current drain may be but after pulling all fuses the drain remains. I'm puzzled because unless the circuit is NOT fused I should haved been able to isolate the problem. So I'm wondering if you may know of a common electrical problem with a similar symtom for this make, year, and model of my car.

Thank you,

Jake.