How to check car fuses

Changing a fuse

Always replace a fuse with one of the same rating. Replacing, say, a 10amp fuse with a 30amp one could result in considerable damage. The 10 amp fuse would normally protect a circuit carrying 7 amps: a 30 amp fuse would allow a 30 amp current to flow through, with possibly a disastrous effect on the unit or cable it was supposed to protect. Pull out the suspect fuse and, using fine emery paper, clean off any dirt or corrosion from the inside contact surfaces of the clips.

Make sure the new fuse has the correct amp rating for the circuit See How car electrical systems work ; use fine emery paper to brighten the metal caps at each end. The Video Course teaches you everything about modern cars. The fuse-box. Make sure you know where the fuse box is fitted in your car. The location is usually given in the car handbook. Often, the box is half hidden under the dashboard or in the front knee-well. Where they are not numbered, take out each fuse in turn and see which component stops working. A fuse is 'blown' when the connector between its two ends melts under an overload of current.

Each fuse is held together between two clips in the fuse box; these are also the fuse contacts. The clips are sprung, and should hold the fuse tightly in place. In most fuse boxes, the fuses simply push into a pair of spring-clip contacts. Brighten the caps of a new fuse with emery paper. This will remove any tarnish that may have formed and ensure a good contact with the spring clips. Push the fuse into the vacant clips and try the circuit to see if power is restored.

If it is not, check by fitting a fuse of the same rating from a circuit you know is working. If this does not work, the fault is not in the fuse, but elsewhere in the circuit. Engine Block 18 minutes. Every part explained There's ridiculous detail on every part. Clearly and easily explained.

All modeled in 3D We've created the most detailed 3D model ever produced so we can show you everything working. Start watching. Super detailed explanations in the video course 15 hours of pro-quality, HD content with subtitles. This extra power causes the metal wire to burn up breaking the circuit.


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  6. Fuses - If Any Electrical Item Fails In Your Vehicle - Check The Fuses First!

When the circuit breaks the extra power cannot get to the main part that can not handle the extra power. In cars, there are normally fuses in two spots. There is a fuse box under the hood with all kinds of fuses in it, and there is also sometimes some fuses under the dash on the passenger side.

Knowing where your fuses are is important if you want to check them. Some of the fuses are a different color, and each color indicates how much power it can handle. The bigger fuses though are normally a dark gray though and not a color. On the small fuses, you can normally see thru the colored plastic, and this allows you to see if it is blown or not without testing it. Also, blown fuses may have discoloration which is a sign that it is bad and needs to be replaced. The big fuses though you can not see the wire, however, so these you will have to test if you think something is wrong with it.

How to check a fuse visually

Read on to learn how to do this. The first step before testing a fuse with a automotive multimeter is making sure that the car is off and the keys are not in the ignition.

Can a Car Fuse Go Bad Without Blowing?

This will help keep you safe when pulling the fuse out and also protects the car. The next step is to locate the potential bad fuse. To do this, you go to the fuse box and look at the diagram or in the owners manual and find the one that corresponds to the system you are having trouble with. For example, if your power door locks aren't working, then you will want to pull the fuse that goes with that.

How To Check Car Fuses With A Multimeter? - Power Of Auto World!

Then to pull the fuse, you do literally what it is called, and that is pulled straight up on the fuse. You want to make sure you pull straight up because you don't want the prongs getting bent or damaged as you pull the fuse out. Once you got the fuse pulled you can visually inspect it. If it is a clear plastic you can try to see if the connection seems broken. If you can't see the wire through, then it is time to get the multimeter out. To use the multimeter you first have to turn it on and get the probes out.

You then can set the multimeter to ohms. This will measure the resistance of the fuse. You can then touch the probes together. This gives you a baseline reading and will tell you roughly the number you will get once you put the probes on the fuse. Once you have an idea of the reading, you should expect you can connect the probes to the fuse. To do this, you just have to touch one probe to one prong and the other to the other prong.

This will give you a reading. If the reading is close to what it was when the two probes touched, then the fuse is fine.

How to Change a Vehicle’s Fuses

If it does not give a reading, then that means the fuse is blown. This is because the current it is trying to send thru the fuse is not making it back thru. To make sure the fuse is blown you can change the multimeter set to the setting to measure the current which is the arrow with a line. You can then touch the probes to the prongs on the fuse in the same way.


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If it beeps continuously, then the fuse is fine, but if it does not emit a sound, then the fuse is blown.