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How Does it Work / Wiring

How Car Wiring Works

The wiring system in a vehicle has developed into an elaborate system of wires and wiring harnesses. The key to understanding and diagnosing electrical problems is to study a wiring schematic. Think of wiring as a little highway that delivers electricity to a particular component. Use a wiring diagram to follow the flow by using a test light. Intermittent failures can be difficult to diagnose, but with a little persistence the problem can be detected and repaired. A car wiring system is made up of many smaller systems that can communicate with each other when needed.

Car Wiring Harness
Car Wiring Harness



One of the most important components of an electrical system is the battery. The electrical system starts and stops with the battery. From the battery, the engine utilizes electricity necessary to start the vehicle. While the vehicle is operating the electrical system is energized and recharged by the alternator that is powered by the engine. Complications can occur if there is a loose connection somewhere in the system. While this condition is not a shorted circuit problem this condition simply breaks the flow of electricity. To trouble shoot this problem consult a repair manual to locate the wiring schematic for your car. Repair the broken connection as needed and recheck system.

The primary purpose of an electrical fuse is to help protect a circuit from damage in the event of a short. A fuse is designed to break, stopping the voltage flow in the event of a power overload or short circuit. Each vehicle has several fuses that are necessary to safe guard electrical circuits.

Electrical Fuse

Additionally it is very important to note the many electrical problems can cause a fuse under the dashboard to blow which will require the fuses to be replaced in order to actually fully repair the electrical problem. Without replacing the electrical fuses, you are not going to be able to determine fully if the electrical problem is corrected. Often if the problem is corrected it will not blow any additional fuses, however if the electrical problem is not fully solved it is highly likely to still blow several more fuses in the process.

The most common cause of a short tends to be when a piece of wire has a small exposed area that is bare. This piece of bare wire can often rub against metal and create issues for the electrical system because of the sudden surge in electrical current. While there can be numerous causes for a blown fuse, the majority of the causes of a blown fuse tend to be quite simple to repair. Once the failed wire is located the solution usually takes only a few moments to correct. Usually something as simple as repairing a bare wire.

Looking under the hood on occasions for bare wires can also help. Anything that looks bare, or appears to be losing its insulated coating should be thoroughly taped with electrical tape to help ensure that the wire does not start causing problems with your fuse system or other electrical components. Avoiding proper maintenance on your car, no matter how simple can result in costly repairs.

How Does it Work / Wiring

Check Manufacturer Specific Wiring Questions and Answers

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