![]() Like the jumper wire, the 12 volt test light is used to isolate opens in circuits. Any wire insulation that is pierced by the test light probe should be taped and sealed with silicone after testing. Never use a pick-type test light to probe wiring on computer controlled systems unless specifically instructed to do so. It is advisable before using the test light to touch its ground clip and probe across the battery posts or terminals to make sure the light is operating properly.ĭo not use a test light to probe electronic ignition, spark plug or coil wires. This does not necessarily mean that 12 volts (or any particular amount of voltage) is present it only means that some voltage is present. The test light will illuminate when voltage is detected. To use a 12 volt test light, connect the ground clip to a good ground and probe wherever necessary with the pick. The test light is used to check circuits and components while electrical current is flowing through them. 1: A 12 volt test light is used to detect the presence of voltage in a circuit Some electrical components, such as fuel injectors or sensors, are designed to operate on about 4 to 5 volts, and running 12 volts directly to these components will cause damage. You can sometimes connect the jumper wire directly from the battery to the "hot" terminal of the component, but first make sure the component uses 12 volts in operation. When the component stops functioning, or the power is cut off, the open is in the segment of wire between the jumper and the point previously tested. By moving the jumper wire successively back from the component toward the power source, you can isolate the area of the circuit where the open is located. If the ground circuit is good, but the component does not operate, the circuit between the power feed and component may be open. If the component operates only with the jumper installed, the ground circuit is open. If an electrical component fails to operate, connect the jumper wire between the component and a good ground. Jumper wires are used primarily to locate open electrical circuits, on either the ground (-) side of the circuit or on the power (+) side. Use a 5 amp fuse to provide protection against voltage spikes. By inserting an in-line fuse holder between a set of test leads, a fused jumper wire can be used for bypassing open circuits. This is commonly referred to as a "fused jumper". It is also advisable to include a standard automotive fuse in any jumper wire. In cramped, hard-to-reach areas, it is advisable to have insulated boots over the jumper wire terminals in order to prevent accidental grounding. Although jumper wires can be purchased, they are usually fabricated from lengths of standard automotive wire and whatever type of connector (alligator clip, spade connector or pin connector) that is required for the particular application being tested. ![]() They are basically test wires which are used to bypass sections of a circuit. Jumper wires are simple, yet extremely valuable, pieces of test equipment. Jumper wires should only be used to bypass lengths of wire or to simulate switches. This may, in turn, cause damage and fire. Bypassing resistances, in effect, creates a short circuit. Never use jumpers to bypass high resistance loads in a circuit. If the jumper wire is of too small a gauge, it may overheat and possibly melt. ![]() Never use jumper wires made from a thinner gauge wire than the circuit being tested. In addition to the information covered below, the tool manufacturer's instructions booklet (provided with the tester) should be read and clearly understood before attempting any test procedures. The following describes different types of commonly used test equipment and briefly explains how to use them in diagnosis. ![]() Pinpointing the exact cause of trouble in an electrical circuit is most times accomplished by the use of special test equipment. ![]()
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