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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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