Ok, in my project I decided to go with a 3-wire Bosch IAC(I do have a 2-wire Bosch IAC from Siemens ECU) and I searched the net for a resistor value. In all topics people say that you must connect one of the coils to ground through 35Ohm/50W resistor. But here is my question.

When I calculate the power through the resistor i get only 5 watts of dissipated energy which is far from 50 watts. That's without the load which will add a little more resistance.

U=14.2V

R=35Ohm

=>

I=0.40A

P=5.76W

Let's double the resistor wattage and go to 35Ohm/10W resistor. Is that okay? Yes, it'll get a little hot, but it'll be far from burning something. I need to test this.

When I calculate the power through the resistor i get only 5 watts of dissipated energy which is far from 50 watts. That's without the load which will add a little more resistance.

U=14.2V

R=35Ohm

=>

I=0.40A

P=5.76W

Let's double the resistor wattage and go to 35Ohm/10W resistor. Is that okay? Yes, it'll get a little hot, but it'll be far from burning something. I need to test this.