A fuse should always be placed between the voltage source and the circuit (load).12V -> fuse -> circuit -> GndPete
We use to say the component usually protects the fuse
Good for motor driving, can save the power supply/drivers if the motor stalls and the electronics can't handle the resulting surge when the motor looks like a dead short.
I'm asking because I want to know if the fuse will protect both the 12V and 5V components if the fuse was connected right before the common GND.
No putting a fuse in the ground is wrong and will not work anyway.