If half of a string of Christmas lights is out, it is likely because of a single burned-out, loose, or broken bulb within that section. Long strands of lights often contain more than one circuit, so when one bulb fails, it can cause the entire circuit (or half the strand) to go dark. To fix this, inspect the unlit section and test each bulb to ensure it is tight and functioning properly. Replacing the faulty bulb or repairing a damaged shunt will typically solve the problem.

You can take a few steps to prolong the life of your holiday lights. Make sure to replace burnt-out bulbs as quickly as possible to avoid overloading the rest of the circuit and knocking out more lights. Before packing them up each year, plug each strand into the wall to confirm everything is still working. Wrap the lights carefully back into their original packaging or something similar—winding a strand tightly together or leaving it to hang loose in a storage bin can lead to frayed or damaged wiring. 

The cost to repair a short circuit depends on the type of repair. A faulty outlet or simple loose wire can be a simple fix that might only cost a handful of dollars. For example, if you need to rewire a house, you’ll spend around $2 to $4 per square foot, but replacing an entire electrical panel costs anywhere from $500 to $2,100.  

Pool lights are designed to be safe by protecting swimmers from electrocution. These lights are made with waterproof fixtures and seals to prevent contact with the water.

Electrocution from pool lights is still possible, but rare. Faulty wiring or broken lighting equipment can make lights unsafe, so it’s important to replace lights as needed and have an electrician inspect and upgrade the wiring.