I’m looking at a light fixture on Craigslist, but I’d like to see if it works first.
I have a multimeter that I needed for another project. Can I use the multimeter to test the light fixture before buying it? How would I use the multimeter to test the light fixture?
Best Answer
You don't need a bulb at all to test the fixture. There should be one main "neutral", and one main "hot" wire coming out of the fixture. If there's more than one of each, you can tie each set all together, or test each one individually. The following procedure assumes a single "hot", and single "neutral".
First, set the multimeter to test continuity , or the lowest resistance setting.
Test the "neutral" wire
Next, test the "hot" wire.
The threaded portion of each socket should show continuity (or low resistance), with the "neutral" wire. While the contact at the bottom of the socket, should show continuity (or low resistance) with the "hot" wire.
If one or more of the sockets doesn't test out, you may be able to repair the fixture. It's up to you if you're willing to put in the work.
If you know what size socket it is, you might want to fit a bulb in the sockets to make sure they're not physically damaged (deformed, etc.).
As @MichaelKaras points out, you'll also want to check to make sure there's not continuity between "hot" and "neutral", or either of those and the body of the fixture.
If any of these tests show continuity, then the internal wiring is likely damaged.