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Right now, the microcontroller pin's output drive capability is limiting the current into the base, and if you took a multimeter and measured the voltage from base to ground, you'd probably get about 1. With a minimum current gain of , to drive your 3A load you need 3mA into the base. Let's say we double it for "safety" to 6mA. The two 0. Can you try putting a resistor, roughly to 1K ohms, in there in series with the base and see if that helps?