How Do You Know If An RVs Fuse is Blown?

Fuses are an integral part of any RV electrical system. If there is an overflow of current, the fuse will break the circuit. This prevents many kinds of heat and fire hazards.

Now, it does not happen every day. So, forgetting how to check if an RV fuse is blown is not a big issue.

First, you have to determine whether the problem is the fuse or not. Then you have to find out which fuse is the problem and how to fix it if the fuse is blown. It is a piece of cake if you have the right gear. If you don’t have the right gear, go get it from somewhere.

How Do You Know If An RV Fuse is Blown

To know if an RV fuse is blown, it is wise first to understand RV electrical system. With a good understanding of the electrical system, detecting a defective fuse will take less than a minute. Below are several ways to know if an RV fuse is blown.

How Do You Know If An RV Fuse is Blown

It Starts with Electrical Appliances Going Off

You might have been in an RV, and suddenly, the lights and some of the electrical appliances went off. This is an indication of the blown fuse.

However, the failure of electrical appliances in your RV might result from faulty appliances. Therefore, you may not entirely rely on this technique to ascertain a fuse burst.

If you check the appliances and affirm that they are reasonable, move on to the next step.

Locate the Fuse Block Panel and Test the Fuses

An RV fuse block panel diagram is located at different positions in your RV. Consult the RVs manual to identify the exact location of the fuse block panel. The panel might be situated in the cabinet, under the driver’s seat, or even on the dashboard.

Upon successful location of the panel, open the board to check the RV fuses and breakers for any faultiness. There are several ways of checking the condition of fuses in the panel. In case the RV fuse panel red light pops up, the fuse is blown and needs to be replaced.

There are a few methods of testing the fuses after you have located them int he panel.

Method 1: Visual testing of the fuse

Most of the fuses installed in the RV are transparent, and hence visual checkup can verify whether the fuse is blown.

Visual testing of the fuse

A blown fuse will either be broken or discolored with a melted connecting wire. Such a case indicates a blown fuse that requires replacement with a new but similar fuse.

Method 2: Check the fuse with a multimeter

A multimeter is considered to perform various functions in the electrical field. One of the significant roles includes measuring the current.

Check the fuse with a multimeter

To check RV fuses with a multimeter, use two connecting wires at the bottom of the multimeter to connect it to both ends of your RV fuse and test for continuity and the resistance of your fuse. If the fuse is in good status, it will make a loud beep while displaying the resistance.

Method 3: Use of a Dual LED blown fuse indicator circuit

Dual LED is one of the easiest to determine whether a fuse is blown or not. The fuse blown indicator circuit uses two-color LEDs; the green LED indicates a fuse in good condition, while the red LED indicates a nonfunctional fuse. It is advisable to have the blown fuse indicator in your RV toolbox.

Use of a Dual LED blown fuse indicator circuit

What Causes a Fuse To Be Blown

If the RV power circuit breaker receives high voltage power, the fuses blow, and the circuit breaker turns off. Below are several conditions that cause a fuse to blow.

What Causes a Fuse To Be Blown

1. Circuit overloading

Circuit overloading is the most common cause of your RVs’ blown-out fuses. You should ensure that the sockets and extension cables hold the standard number of plugging. The travel trailer furnace for warming your RV should not be left running while driving to prevent overloading.

2. Short-circuiting

Short circuits occur due to exposure and loose connections that spark charges that heat the wires. Short-circuiting can be avoided by adequately ensuring naked links are well covered and sufficiently mastering the RV electrical wiring diagram.


3. Arc fault

An arc fault occurs at contact points in a wired connection due to loose or arcing sparks. Fix an AFCI breaker to sense such loose connections in advance to avoid blowing your RV fuse.

If your RVs fuse keeps blowing, you should consult an electrician to examine the whole wiring connection.

How To a Fix a Blown Fuse

If a fuse blows, you must replace it with a fuse of the same type. You might need to turn off the electricity. The Fleetwood motorhome fuse box diagram provides a clear understanding of the connections.

If your fuse is blown beyond recognition, check first on the diameter of the wire charts online to determine the required type of fuse. You can also use the speed of the fuse in its field of application. High-speed motors such as the 5th wheel apply slow-blowing fuses, while the standard electrical appliances in your RV require fast-blowing fuses.

How To a Fix a Blown Fuse

It would be best to never replace the blown-out fuse with a wire of any other conducting material. The recreational vehicles use a 30 Amp car fuse wire for most lighting purposes. RV fuse replacement should be done while the vehicle engine is off.


A fuse is an important safety device that helps protect your electrical appliances from damage during short circuits and current overloading.

Knowing what causes a fuse to blow and skills on how to detect and fix a blown fuse is an added advantage as you enjoy the comfort of your RV. It would be best to be cautious when powering light power appliances for the heavy fifth wheel RVs since it operates under high voltages.

As a precautionary measure, equip your toolbox with the necessary tools for fixing a blown fuse, such as the digital multimeter.I hope we have made replacing a blown fuse a bit easier for you.