Do you have a multimeter? Can you borrow one? The multimeter will tell what is wrong. They usually cost about $20. Turn off the power to that circuit by flipping the breaker. Check the circuit with "volts" setting. If volts is zero, you are safe to check resistance. Check resistance with multimeter across contacts of light socket. Zero resistance is a short circuit. Infinite is a open circuit, which is good.


https://www.lowes.com/pd/Southwire-D...meter/50081424