![]() (Hard Wire Only) Vehicle has combined brake and turn signals, brake light wire on harness is not grounded. Using one turn signal engages the turn signals on both sides of the trailer. Like an automotive test light, using a multimeter to test a home plug fuse is a good solution if you suspect a blown fuse but can’t find any clear visual signs. Harness has been overloaded due to excessive draw from lights or a short in the trailer wiring.National Institutes of Health Go to source With the car completely off, locate the fuse in question and remove it by grabbing it firmly with the fuse puller stored in the fuse box, or with a pair of needle nose pliers. ![]() ![]() X Trustworthy Source PubMed Central Journal archive from the U.S. Most fuse boxes will have a diagram displaying the name and location of each fuse. 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.Look at the colors of the cables, each one corresponds to certain amperage. However, you can make the puzzle much easier. From these, you can read that the total number of Amps in fuses must be 120. 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. You can find the solution to the puzzle in the notes taped to the wall next to it. 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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