how to test christmas tree lights with multimeter

Testing Christmas tree lights with a multimeter is a simple process that can be done in just a few steps. First, turn off the power to the tree and unplug it from the wall outlet. Next, set the multimeter to the "ohms" or "resistance" mode. Then, connect the probes of the multimeter to the male and female ends of the light string. If the multimeter reads zero ohms or very low resistance, then the light string is likely working properly. If the multimeter reads a high resistance or infinite resistance, then the light string is probably broken and needs to be replaced.