Firstly, before, doing any electrical system testing, make sure you have voltage.

Because, all electrical circuits, require voltage to operate the components, connected to that circuit.

Consequently, if there is no voltage, there is no function. So, the first order of business is, to check for the presence of voltage, at the load point in the circuit.

So, when doing electrical system testing, start at the load point of the circuit. Consequently, that is where the part is receiving power. Use a voltmeter or a 12-volt test light, that glows when there is voltage. However, a voltmeter is the best tool for this purpose. Because, it will give you an exact reading, but a test light is OK for performing, quick voltage checks.

Using An Electrical Test Light, To Do Electrical System Testing

So, using a test light, is a quick way to check for voltage. But, suppose you find no voltage at the load point. Then, check the fuse, fuse link or circuit breaker, that protects the circuit. Similarly, the power relay, that supplies voltage to the circuit. Finally, if the problem is a blown fuse, replacing the fuse will restore power.

So, a faulty circuit breaker or an open relay, will have the same effect, as a blown fuse. The easiest way to check a circuit breaker is, to bypass it with a jumper wire. Your jumper wire, should have a replaceable inline fuse, to protect the circuit against damage. If the circuit works when you bypass the circuit breaker, you have isolated the problem. Replace the circuit breaker.

Electrical system testing, done above, can also be used to check, a questionable relay.

A relay is nothing more than a remote switch, that uses an electromagnet, to close a set of contact points. When the relay magnet is supplied with voltage, the points close and battery voltage, is routed through the main circuit.

Choose Your Electrical System Testing Help Topic Below

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Car Starter Motor – How Do You Know If Your Starter Motor Is Failing

Sensors In Cars – Devices That Monitor And Control Engine Parameters

Ignition Switch – Common Signs Of A Failing Ignition Switch

Push Button Start – Keyless Entry System – Engine Does Not Crank

Automatic Shutdown (ASD) Relay – Function – Failure – Electrical System Testing

Fuel Pump Relay – Function And Testing Procedures

Automotive Fuses – If Any Electrical Item Fails – Check The Fuses First

Engine Cooling Fan – Is Yours Working – How To Test It

Dash Warning Lights – Only Provide A Warning Something Is Wrong

Ignition Coils – Take The Low Voltage From The Battery And Amplify It

Automotive Sensors – Why Are Sensors So Important Today

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