Servos outputs / power

Hi there. I have supplied 5v power to aux1 on pixhawk. I have checked the other aux channels and they output 5v now. So i connected a servo on aux4. However the servo is not powering on eventhough aux 4 has 5v power. Anyone knows why?

it has to also have a signal, what is the output chanel set to? it would be servo12_function i think

Yes it is servo function 12.