While using a digital multimeter to diagnose electrical problems on customers’ equipment, I frequently hear the comment, “I’ve got one of those multimeter things, but I never learned how to use it.” ...

Q: I have a tenant who complained that a light fixture wouldn’t light. After I replaced the switch, the light still wouldn’t come on. I realized that all the bulbs were out. Anyway, is there a way to ...

Q. I installed a dimmer switch in my dining room and now the chandelier only works half the time. There are two switches in the room that control the light. They worked fine before I started the job.