According to Dave :
What is the 'lightbulb' trick?

Simple way to test fuse circuits for shorts:

Find a small wattage lightbulb, screw it in place of the fuse. If it
lights, you have a short. If it doesn't light, you don't.

Make sure there's nothing else turned on the circuit.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.