A higher resistance means a degraded or potentially blown fuse, and a reading of OL (over limit) means the fuse is definitely blown. If the multimeter displays a resistance between 0 and 5 Ω (ohms), the fuse is good.Touch the other probe to the side of the terminal near where the threading stops. To test it, touch one of the multimeter’s probes to the very tip of the fuse’s terminal. Plug fuses, which are often found in home fuse boxes, have threaded terminals that look like the ends of standard light bulbs.Set the fuse glass-side-down on a non-conductive surface, such as a wood workbench or laminate counter, so the metal plug end faces up. Set your multimeter to test resistance the setting looks like the Greek letter omega, or “Ω.” Turn off the fuse box’s main power switch, then remove the fuse you’d like to test. Test a plug fuse with a multimeter if you don’t see signs that it blew.
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