Gap Definition
To test for an open circuit, connect a tester or voltmeter lead to the negative battery terminal or ground.
Connect the other wire to the plug of the circuit under test, preferably the one closest to the battery or fuse.
Turn on the circuit, remembering that some circuits will only be energized when the ignition key is in a certain position.
Most of the defects and other damage are due to poor connections, corrosion and broken wires.
Short circuit
To check for a short circuit, disconnect the circuit load (these are those components of the system that are powered by current, for example, light bulbs, electric motors, etc.).
Remove the appropriate fuse and connect a tester or voltmeter to its leads.
Turn on the circuit, remembering that some circuits will only be energized when the ignition key is in a certain position.
If there is voltage, it means the circuit is shorted.
If there is no voltage and the fuse continues to blow under load, this indicates a defect in the load circuit.
Ground defects
The negative battery terminal is connected to ground, so any loose connections or corroded support elements can lead to an open circuit.
To check for a proper ground connection, disconnect the battery and connect one ohmmeter lead to a well grounded ground end. Connect the other end to the wire or ground of the connection being tested. The resistance in this case should be zero: if it is not, check the connection as indicated below.
If the connection is suspected to be broken, disconnect the data from it and clean the contact surfaces. It is recommended to put washers between them for good electrical contact. After repair, apply petroleum jelly or silicone grease to the joint to prevent corrosion.
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