Hi guys I am new to the forum, I have looked around a bit and it looks like a great resource for learning. So I am re-designing the fuel system in my car and have come across an issue. For the controller I need to limit the pump speed at idle and low demand conditions to do this I need a resistor capable of handling 12v (13-15 realistically as most batteries output exceeds 12) and 30 amps. The pumps max draw peaks at 21 amps in extreme conditions so I chose to shoot for 30. The stock resistor pack is .7 ohm, it is a little light for the pumps needs so I am shooting for .5 ohms. So far I am having trouble finding any resistors that will meet my needs. I have also been told a pwm would be another option to control the pump speed but cannot find one that will handle the loads either. Is there a way to build a resistor or pwm circuit to do what I need, parallel resistors perhaps and if so what would you recommend.
Thanks I appreciate the help
Thanks I appreciate the help