Why is there no power to some fuses in the car’s fuse box

One of the common reasons there may be power loss in a car’s fuse box can be due to faulty ignition cause, dead batteries, wiring issues, malfunctioning fuse box, or a damaged starter relay, among others.

The fuse box is powered directly by the batteries and is significant in driving by preventing any damage to the car’s electrical components. With the fuse box dead, the currents passing may harm it and thus prevent your car from starting. 

The car’s fuse box protecting the engine components ensures that your vehicle is in a suitable condition to move freely without external effects like the weather.

A malfunctioning fuse box eventually affects the associated devices used in one circuit. In different cases, a faulty fuse may even damage the car and cause it not to start.

The damaged electrical wiring can cause overheating and even fire, especially if the circuit was linked to many appliances simultaneously. 

Possible causes of this problem

The causes of power loss can be determined by checking if your battery is in good condition and the alternator. However, a reliable professional can be involved to assess the condition of your car and therefore advise accordingly. Some of the few causes of complete electrical power may include:


This is one of the main causes of power loss and is caused when added components are installed, which translates to more voltage usage, which may cause the fuse box to fail.

As a result, overheating causes failure of the electrical system and thus lead to power loss. However, in the case of bad electric cables, this may fully compromise the functioning of the engine due to poor transmission of energy.

Bad electric cables usually lead to sudden shut-off with the car and cause power loss. 

Battery problems

A car battery plays a very important role in the starting of an engine. It powers the accessories in the engine and has the required amount of power to start the vehicle.

Therefore, a faulty or dead battery will refuse to kick start itself. Battery problems or issues can, however, be detected on your car’s dashboard; thus, you can solve the issue quickly.

Battery problems essentially happen due to wear and tear of faulty alternators. Though they may be replaced in a few instances, they eventually die out, thus leaving the car with no power to operate. 


The ignition system is responsible for powering the spark plug and ensuring that there is stable voltage for the spark plug. Ignition components are therefore essential to a car; if they go bad or refuse to work, they affect the engine performance, and one loses electrical power.

Incorrect amperage: fuses have been known to break down due to incorrect amperage, especially while replacing and using more current on areas meant for lower voltage.

This mistake causes the fuses to break down, thus contributing to the car’s loss of electrical charge or power. Incorrect amperage is also harmful and puts the fuse box at the risk of overheating and damage.

What are the symptoms of a faulty fuse box?

  • Constant burning smell. This is the first sign that should warn you that your fuse may be at fault. Blown fuses will also have a distinct smell, and also evidence of the burning up can be witnessed in the form of burn marks on the fuse box.
  • Overloaded circuits will also start blowing, mainly due to associated accessories and devices. This becomes a clear indicator that your fuse box is very faulty. 
  • Shock. The slight shocks or tingling sensations felt while touching appliances are also one of the most common indicators that your fuse may be faulty, and there is a need to upgrade it. 
  • The dashboard can also indicate when there is an issue with the engine that may direct you to the fuse box. Flickering or dimming lights will often communicate the issue and thus alert you when there is a need for a change in the fuse box. 

How do you solve no power to a fuse problem?

Before tampering or interfering with the normal functioning of your car, you must consult a professional, especially in an instance where you are not too sure of the problem. However, you can also follow a few steps that may help:

  1. Remove the cover to your fuse box, which will help you identify the blown fuse. 
  2. After identification, remove the blown fuse with your hand or protective gear. 
  3. Replace with a new fuse at the same spot you removed the blown a fuse. It is essential to ensure that you put a compatible fuse with the correct amperage.
  4. Cover your fuse box and start your car. A replaced fuse box may come in handy in this situation.

Final thoughts

It is important to note that further tampering with the fuse box can create more issues; thus, you should have a reliable, professional check if you do not know about solving it.

No power to some fuses in the box needs effective solutions that are practical and easily applicable. At the same time, you must take care of your car using the correct devices and accessories to avoid damage to your engine.

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