Ok dev after having a proper look at ur wiring now and not having a sleeping tablet to confuse me u have mixed up wires. Ur source u have connected to the gate, ur drain u have wired correct, and ur gate u have connected to ur source. So the way u are holding the mofset is correct but dont use the markings on there. I cant make out if u have wired switch in on the pic but remember the gate goes to switch and from switch to positive together with positive on 510. If u rewire correct it should still fire