A boost controller is a device to control the boost level produced in the intake manifold of a turbocharged or supercharged engine by affecting the air pressure delivered to the pneumatic and mechanical wastegate actuator.

R= ~30 Ohm

● When there is no electrical signal, the long connection is closed. 
● The two short connections are connected to each other. 
● When actuated, the link between the long connection and the two short connections is opened.