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Yes, animals can trigger motion-sensor lights. In fact, this is a reason why some homeowners install motion-sensor lights, to catch sneaky little critters looking through the rubbish for a midnight snack. There are sensitivities to animal detection though, so you may want to look for an option that avoids animal detection as much as possible.

Testing tools, such as Christmas light testers, non-contact proximity electrical testers, and multimeters, all simplify the process of testing Christmas lights. However, without one or more of those tools, testing Christmas lights the old-fashioned way only works sometimes. Without testing tools, the simplest testing method is visual inspection, which may or may not yield positive results.

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.

DIY is possible for minor issues like bulb replacement. Professional services ensure proper wiring and functionality.