I plan to install a basic stepless control switch for my 12 volt heater fan. My understanding of electronics is quite limited. The wiring for this device is simply Red - pos. side of motor & power supply Green - neg. side of motor Black - neg. side of power supply
I presume that the motor speed is regulated by controlling the ground side of the circuit, correct? Here’s what I don’t get : why is the positive side routed into the switch? Seems to me that the motor still has a direct connection to positive, based on the joining of the red wire to power and to motor… I don’t understand what role the switch plays on the plus side.
Someone please explain this tinker toy level electrical control to me.
