How to test your vehicle’s fuses along with some tips. This includes using a test light, digital multi meter and analog multi meter. Voltage and continuity tests will both be covered in this video. Fuses are used to protect a circuit, if a circuit is overloaded or there’s a short, the conductor link in the fuse will burn out immediately switching off the circuit so there’s minimal risk of damage. Fuse locations can vary between vehicles and they maybe spread throughout a couple different areas of a vehicle. You can usually find this information in your owner’s manual. Fuse boxes or also referred to as a power distribution boxes can be located under the hood, under the dashboard, in the glovebox, under the rear seat, in the trunk, or even on the floor carpet. #electrical #electronics #multimeter

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Tools/Supplies Needed:
-needle nose pliers
-digital multimeter
-analog multimeter
-test light

Chapters:
00:00 Intro
00:18 Purpose of a Fuse
00:41 Fuse Locations
01:10 Different Testing Tools
03:10 Testing While Installed
03:18 Test Light
04:37 Digital Multimeter
05:15 Analog Multimeter
05:55 Interior Fuse Testing
07:06 Fuse Removal
07:38 Fuse Testing when Removed

Procedure:
For a test light, the ground clamp will need to be connected to a ground source. With the battery being so close, the negative terminal is a great source. A bare body bolt or bracket can also be used.

Verify the test light is working and you have a good ground source by touching the tester light on the power source. Testing the fuses, touching the probe on the exposed test terminal on each of the fuses. There are two locations to test on each side of the fuse, one will be the power coming in and the other is the power going out with the fusible link in the center. On a good fuse, the test light will work on both sides. If the test light only works on one side of the fuse, that means the fuse is burnt out and will need to be replaced.

There are circuits with no power present. This would mean the circuit is off and needs to be activated. Refer to the diagram on the cover, it lists these circuits for the vehicle’s lighting such as daytime running lights, low beams, high beams, etc. To power up these circuits, turn on the vehicle’s exterior lights. Back to testing, there is now power at each of the fuses and we can see the fuses are good.

For a digital multimeter, set it to the two digit dc voltage setting. Just like the test light, we will need a sufficient ground source, again I’m using the negative terminal on the battery. Touch the positive probe on the positive post to ensure the meter is working correctly and we have a good ground source. Then continue to test each side of the fuse on the test terminals.

An analog meter is very similar to a digital multimeter. Use the 50 volt max measurement as the 10 volt setting will max out the needle swipe. Same as before, use a sufficient ground source and test the meter first. Then continue to test each of the fuses with the vehicle’s electrical system on.

A fuse can also be removed for testing and inspection. Your vehicle may have a fuse removal tool which can be found in the lid of the distribution box or somewhere within close proximately. Grab onto the fuse, then pull.

With a burnt-out fuse, you should be able to see a burn mark on the inside of the clear plastic along with a space in the fusible link.

For a continuity test, this can only be done with the fuses removed and with a multimeter. This can be done using a resistance test or continuity function.

Testing a good fuse, touch the probes on the spade terminals. We do have a reading which means this fuse is good. As for testing the already known blown fuse, touch the test probes on the spade terminals. There is no reading, this means we have an open circuit so the path for voltage to flow is broken or burnt out.

For a continuity test, this is shown by a diode symbol. At the moment, the screen shows 1, this means an open circuit as the probes do not have a connection between each other. Testing the good fuse, when a connection is made, we’ll have a reading shown as a low value. For the blown fuse, you can see there is no value registered, meaning it’s an open circuit, therefore the fuse is no good and will require a replacement.

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