To open the fuse box, you will need to pull the clip or tab and slowly remove the lid. Open the fuse box and locate the faulty 40 amp fuse On many vehicles, the fuse box will be labeled. The fuse box is usually located on the right side of the engine, next to the battery.
40 AMP FUSE BLOWN MANUAL
You can always check the owner’s manual to learn more about your vehicle’s fuses. However, the 40 amp fuses are usually located under the hood. The most common locations for fuse boxes are underneath the steering wheel and under the hood. Some vehicles can have fuse boxes in multiple locations.
40 AMP FUSE BLOWN INSTALL
Also, do not try to install a fuse with different amperage as it will get blown immediately. There are blade-style and cartridge-style 40 amp fuses. Just make sure that you get the exact same as your blown fuse. The 40 amp fuses are so cheap that I just order a bulk of 10 online. Order a new 40 amp fuseīefore you start the replacement task, you will need to get a new 40 amp fuse.
40 AMP FUSE BLOWN HOW TO
So, instead of wasting money, here is how to replace a blown 40 amp fuse: 1. For example, a new 40 amp fuse costs around $2, but you can get charged up to $100 in a repair shop. Replacing a blown 40 amp fuse can save you a lot of money. By doing this, the 40 amp fuse prevents further damage to the main component. No current will flow into the other copper contact and into the main component. However, when a higher than normal current is being drawn from the car battery, the high current will enter one copper contact, but the metal alloy strip will get melted. When current comes from the car battery, it enters one copper contact and then flows through the metal alloy strip, into the other copper contact, and to the main component. A properly working 40 amp fuse has a metal alloy strip that acts like a bridge between two copper contact. If for some reason a higher current is being drawn from the main component, the 40 amp fuse will get blown and prevent the main component from being damaged. If the 40 amp fuse is blown, the fuse wire will look like a broken bridge between the two copper contacts.Ī 40 amp fuse is designed to withstand 40 amps of electricity. Remove the plastic top cover and check for damages in the fuse wire. You can tell that a 40 amp fuse is blown by visually inspecting it. When the 40 amp fuse gets blown from a high current, the fuse wire in the middle of the cartridge melts and prevents further electricity flow. The 40 amp fuse has copper contacts on both sides and a metal alloy strip or thin wire running from one copper contact to the other. When a 40 amp fuse gets blown, the metal alloy strip or thin wire inside will look like it is broken. By doing so, the 40 amp fuse protects the main components from getting burnt. This action stops the high current from reaching the next stop which is the main component. The 40 amp fuse detects that the current is too strong and instantly gets blown. When this happens, the current travels from the car battery, into the 40 amp fuse. So, when some of these ECUs malfunction, they tend to draw more current from the battery than they are designed to withstand. There isn’t room in the fuse box for each ECU, so many of them are protected by the same 40 amp fuse. Each of the electronic control units has been designed for a specific job including ABS, power steering control, the way to power windows, seat heaters, and AC. Today’s vehicles can contain up to 100 ECUs, maybe more. So, instead of expensive components getting burned by drawing higher current each time they malfunction, vehicle manufacturers came up with a $2 40 amp fuse that will get blown instead of the main component. When some of the components draw a stronger current than it is designed to handle, the 40 amp fuse gets blown in order to stop the current from traveling to the main component and burning it.īasically, the larger the amperage, the more important and expensive the component is. This includes the ABS system, ignition, ECU, window regulator mechanisms, and AC fans. The 40 amp fuse is used in vehicles to protect components from overcurrent and short-circuiting that require 40 amps to operate. Visually inspect the 40 amp fuse to verify that it is blown.Open the fuse box and locate the blown 40 amp fuse.The fuse wire that is supposed to allow current to flow through it will appear like melted/broken. You can tell that a 40 amp fuse is blown if you visually inspect it.
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