Fuses fail for one reason, they are over loaded past their amps rating.

Many times a year I have vehicle owners drive in and ask us to look at their fuses. A fuse does not fail just because it’s old. They fail due to the load placed on them. Over loading a circuit with aftermarket equipment is the most common reason for a fuse to fail “blow out” In a home, you have circuit breakers that protect each circuit within the home.

Fuses in a vehicle do the same job of protecting the electrical circuit, but if they fail you must remove the bad fuse and install a new one in the fuse box. Before you install a new fuse, its important to check to see why the fuse failed.

(What caused the fuse to fail) Just installing a fuse without looking for the reason it failed is not going to fix the problem. The second most common reason we see fuses fail is due to coins or metallic junk getting into the 12V aux/lighter socket. I have found ear rings, small tokens, and paper clips stuck in the 12V power sockets. A direct short to ground will cause a fuse to fail instantly. Once you remove the junk from the socket the fuse can be replaced. At our service desk we offer free 12V socket to USB power adapters to plug into the open 12V sockets, just to prevent issues like junk or coins from getting into the socket and shorting the terminals in the socket
.

A 110V inverter to power a laptop can over load an accessory fuse circuit. You do not want to use an inverter larger than 150 watts on a 15 amp fused circuit. Most basic 12V sockets only have a 15 amp fuse to power the socket, and its easy to pop a fuse with an inverter, cell phone, and GPS navigation all plugged in at the same time.

HeyAnthonyAz.com – It’s all good under the hood.