Electrical System Testing - Sensor - Relay - Ignition - Starter - Battery
Electrical System Testing – Sensor – Relay – Ignition – Starter – Battery

Choose Your Electrical System Testing Help Topic Below

Automotive Car Battery – Provides The Power To Starter And Accessories

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 – 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


Electrical System Testing – Sensor – Relay – Ignition – Starter – Battery

So, All electrical circuits require voltage; to operate the components connected to that circuit. Consequently, if there is no voltage; there is no function. The first order of business when troubleshooting electrical problems; is to check for the presence of voltage; at the load point in the circuit.

So, The load point of the circuit; is where the part is receiving power. Use a voltmeter or a 12-volt test light that glows when there is voltage. 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

So, Using a test light is a quick way to check for voltage. But, Suppose you find no voltage at the load point. 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.

This same basic test 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.

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