# Do you have to remove fuses to check them?

## Do you have to remove fuses to check them?

Electrically Testing A Fuse Without Removing It If you don’t want to break electrical continuity to components a fuse handles by pulling it out, a fuse can be checked while still in place using a voltmeter or a multimeter set to “V” (Volts). Note! You should see a voltage reading in the 12-14 volts range.

## How do you tell if a fuse is blown with a multimeter?

Place the multimeter on the ohmmeter setting and place the probe leads across the 2 ends of the fuse. If the reading you get is very low, a few ohms, then the fuse is continuous and, thus, good. If the reading is get is very high, such as severeal Megohms, the fuse is broken and, thus, bad, and should be replaced.

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How do you test a fuse and relay with a multimeter?

The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).

### How much resistance should a fuse have?

If the reading is between 0 and 5 Ω (Ohms), the fuse is good. A higher reading indicates a bad or degraded fuse. A reading of OL (Over Limit) definitely means a blown fuse. If the fuse is blown, replace the fuse with one that is exactly the same (see panel).

### How do you test a fuse with an ohm meter?

Procedure: How to Test a Fuse with an Ohmmeter

1. Set your ohmmeter to the lowest scale on the resistance setting.
2. When testing a fuse, touch the end of each ohmmeter cable to the opposite ends of the fuse.
3. A reading between 0 and 2 indicates continuity—the circuit is good/complete.
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How do you test if a fuse is working?

Place one of the multimeter leads on one end of the fuse. Place the other lead on the other end of the fuse. If the reading is between 0 and 5 Ω (Ohms), the fuse is good. A higher reading indicates a bad or degraded fuse.