I have a microcontroller that I want to use to switch on/off a heavy load (a car horn) with a 30N06L N-channel mosfet. Everything works when running a load of 4Kohms (with the car battery at 12v), but when I move to the heavy load of the horn, then things go awry. I can hear an initial honk, but then the horn stops. I am guessing that the high current powering the horn is causing interference with the rest of the circuit somehow. Does anyone have experience with this?
Also, the reason I am going with this particular mosfet is because it is what I had laying around. If it makes more sense to go to a similar P-Channel mosfet, I can order a few.