A test lamp is used to test a circuit to see if it has power. There are many different models, but the one pictured below is one of the most common used for testing DC circuits. They are relatively inexpensive, and can be found at most electronic, automotive, and hardware stores.
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To use a test lamp simply connect the alligator clip to a source of ground such as a vehicle's frame, a ground wire, or the negative terminal of the battery. This particular test lamp has a pointed end that can pierce a wire's insulation to test the wire inside. If the lamp does not light then the wire does not have power on it (see picture at left). |
| When the wire that you are testing has power on it the test light will light. (see picture at right). |
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