How to Test Current in a Car Fuse Box

A car normally has two fuse boxes. One, located in the engine compartment, is for the electrical needs of the engine, and one in the cabin or dashboard of the car is for accessories and lights. Fuses protect each circuit from excessive amps, which can damage components. if you want to know how to test current in a car fuse box you are in the right place.

Test the current at a fuse box

Troubleshooting a electrical short circuit requires tracking down the faulty connection through trial and error. One place to check is at the fuse box connections, using a 12-volt test light.

Fuses come in a wide range of sizes and styles to serve many applications, manufactured in standardized package designs to make them easily interchangeable. Fuse bodies can be made of ceramic, glass, plastic, fiberglass, molded mica laminates, or molded compressed fiber, depending on the application and voltage class.

Steps to do the current test

The steps you must do to check the current in the fuse box are the following:

  1. Open the panel on the front of the fuse box by pushing back on the latch with your hand.
  1. Turn the vehicle’s ignition to the “power on” (ignition) without starting the engine.
  1. Secure the 12-volt test light clip (a small 12-volt bulb) to any bare metal near the fuse box. A deadbolt is a good location.
  1. Touch the bare metal at the top of each fuse with the test light probe. If the 12 volt test light illuminates, there is power on that connection.

You must touch the bare metal inside each fuse holder if you are looking for a live replacement fuse location.

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