![]() ![]() To avoid this issue, only pull one at a time, write it down, or simply take a picture of the fuse box before removing any fuses. You do not want a 30 amp fuse in a 5 amp location. When removing fuses, it is usually best to only pull one or a few at a time since they need to go back into the correct spot. Simply look at the fuse box cover and remove the fuse for those items while performing this test.įor example, If the radio is on when the key is off and on fuse number 26, then remove fuse number 26 until the test is over. To stop a miss-read, pull the fuses for anything on when the key is off. This process will narrow your search greatly from hundreds of possible wires to a few wires in minutes. The same can be done with any circuit in a car or truck, such as headlights, taillights, radio, or most any circuit in a vehicle. In this example, we would follow the wiring looking for any melted spots on the wire or looking inside the cigarette lighter for any type of melting. The short is in the cigarette lighter or the wiring for the cigarette lighter. So, for example, because the light that went out was fuse number 15, and fuse number 15 is the fuse for the cigarette lighter. Next to the number 15, you will see the circuit name.Īn example would be 14 tail lights, 15 cigarette lighter, and so on. Locate your fuse number, in this case, circuit number 15. Now flip over your fuse box panel cover.Īfter flipping over your fuse block panel cover, you will see the numbers in order. Look at what circuit the fuse is on, for example, lights, and that will point to where the issue is located.Įach fuse box can be different, sometimes with a number, other times clearly labeled with the circuit.įor example, if the fuse you pulled out has a number 15 next to the holes, then the short will be on circuit 15. If you pull a fuse and the light goes out, then this will be the circuit that will have the short. How To Find an Electrical Short in a Vehicle ExplainedĪ vehicle’s electrical system is divided into sections such as the ignition, charging, lights, and so on.Įach section has a fuse that, when removed, shuts it down. Once the light goes out, look at the circuit that the fuse controls, and it will tell you what the short is.Continue pulling and testing your fuses until the light goes out.If the light stays on, put the fuse back in and pull another. As you pull a fuse, look at the test light. If there is a short or electrical draw, the test light will light up. ![]() Place the other end of the test light on the terminal.Clip the end of the test light to the battery terminal.First, disconnect the negative or positive battery terminal.Steps to Find an Electrical Short on a Vehicle Using a 12-volt test light, as shown below, you can locate any short or parasitic draw.īelow is how to find a short on any car or truck using a low-cost 12-volt test light. This process will save you time and money and is a quick way to find an electrical short in almost any vehicle. Wiring issues can be hard to find and locate, but by using a simple test light method, you can narrow your search dramatically. Locating an electrical short in a car or truck can be difficult and time-consuming. ![]()
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