How to Test a Fuse with a Multimeter

Mechanic testing fuse with multimeter

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

Testing a fuse with a multimeter
Testing a fuse with a multimeter
Check a fuse with a multimeter yourself with quality auto parts and testing tools at 1aauto.com

Steps for how to use a multimeter to test a fuse

  1. 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

  2. Set the Multimeter to 20k

    Switch the setting on the multimeter to 20k for the ohms, which measures electrical resistance

  3. Plug In the Testing Leads

    Confirm the testing probes are plugged in to measure the ohms

  4. 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

  5. Find a Non-Metal Surface

    Find a non-metal surface to avoid a false reading

  6. Remove the Fuse

    Remove the fuse from the vehicle so the multimeter doesn’t complete an open electrical circuit and overload

  7. 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.

  8. 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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Summary
How to Test a Fuse with a Multimeter | Tips from Real Mechanics
Article Name
How to Test a Fuse with a Multimeter | Tips from Real Mechanics
Description
These steps explain how to test a fuse with a multimeter if you want to know if a fuse in your car is blown
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1A Auto
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