If you want to test a fuse on your car, you can test one with a multimeter. All you will need is a multimeter that can check the ohms, which measures electrical resistance. These steps explain how to test a fuse with a multimeter, which is quick and easy.
How to Check Car Fuses with a Multimeter
How to Check a Fuse with a Multimeter
Steps for how to use a multimeter to test a fuse
- Find a Multimeter that Can Check the ohms
You will need a multimeter that has resistance so you can check the ohms. The ohms will tell you if the fuse is open and blown or if it’s closed and working
- Set the Multimeter to 20k
Switch the setting on the multimeter to 20k for the ohms, which measures electrical resistance
- Plug In the Testing Leads
Confirm the testing probes are plugged in to measure the ohms
- Test the Testing Probes
Press the tips of the testing leads together to test them. The multimeter should read zero, which means there is little to no resistance. With the tips apart, the multimeter should read 1, which means there is 100% resistance
- Find a Non-Metal Surface
Find a non-metal surface to avoid a false reading
- Remove the Fuse
Remove the fuse from the vehicle so the multimeter doesn’t complete an open electrical circuit and overload
- Inspect the Fuse
Visually check the wire inside the fuse. If the wire is broken, the fuse is blown and it needs to be replaced. Below is a picture of a usable fuse on the left and a blown fuse on the right.
- Test the Fuse with the Testing Leads
Place a testing probe on each end of the fuse. The multimeter should read close to zero. If it reads 1, the fuse has 100% resistance, is blown and will need to be replaced. Unless the vehicle is over 30 years old, fuses will either be usable or expendable
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