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How to find the cause of a blown fuse.

Model: (Various brands) Various
Part: Fuse box

Video tutorial

The method shown in the video for testing fuses uses a DVOM tester in "diode check" mode. We can find the device on Amazon with the code B0BGXYLDCF at a price of €20.86, with free delivery in 10 days.

We identify the circuit, visually inspect the wiring, and check that no aftermarket components have been installed, as this is indeed the most common cause for a fuse to blow. We look for signs of burning not only on the wiring but also on the connectors, sockets, and plugs of the components themselves.

A practical test that prevents blowing additional fuses is to prepare the circuit and configure the multimeter correctly; we connect the black probe to a good ground and use the red probe to touch the output terminal of the fuse holder (the one going towards the components, not towards the battery).

If we hear a continuous sound, this indicates a short to ground: the circuit is closed where it shouldn't be. With the multimeter still indicating a short, we begin to disconnect all components of that circuit.

After each disconnection, we check the multimeter again. When it stops sounding, the last component we disconnected is the culprit.


Posted on 14 December 2025 by ScegliAuto


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Watch the video!


by ScegliAuto

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