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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 system 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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