Exam 16: General Electrical System Diagnostics and Service

Technician A uses the schematic diagram to locate exactly where on the vehicle all of the circuit components are located. Technician B uses the electrical schematic diagram to trace the flow of current through all the switches, wires, connectors, circuit protection devices, and grounds related to the problem before he begins testing. Who is correct?

What are the five steps in diagnosing an electrical problem?

A technician is testing a connector in a circuit with a voltmeter. With the power on in the circuit, the meter reads 12 volts when the leads are placed on each side of the connector. This indicates that the connector _____.

Technician A says dielectric grease is used on wire terminals and connectors to prevent corrosion. Technician B says dielectric grease reduces the resistance between the terminals. Who is correct?

Oscilloscopes are being discussed. Technician A says the vertical positions represent time. Technician B says the horizontal positions represent voltage. Who is correct?

The number of cycles per second is called ____________________.

Connecting an ohmmeter to a live circuit usually results in damage to the meter.

When using an inductive amps probe adapter on a DMM, the function selector should be set to ____________________.

The most common cause of high resistance in electrical wiring is ____________________.

How can you test a circuit that blows its fuse as soon as it is in inserted into the fuse holder?

Technician A uses a voltmeter to check circuit resistance. Technician B uses an ohmmeter to check circuit resistance. Who is correct?

The wiring harness for the SRS (air bag)circuit has a _____ harness cover.

When a circuit protection device (fuse, circuit breaker)opens due to higher than normal current, a short is the likely cause.

A circuit is open when it is complete.

When testing resistance in a circuit with an ohmmeter, _____.

Electrical symbols are standardized throughout the automotive industry.

Voltage drop testing is being discussed. Technician A connects the red voltmeter lead to the most positive side of the circuit being tested and the black lead to the most negative side or part of the circuit being tested. Technician B says the test must be conducted with the circuit operating with normal amounts of current. Who is correct?

All types of circuit protection devices can be checked with an ohmmeter or test light.

The schematic for a relay is typically shown on the outside of the relay.

A voltage drop test can find excessive resistance in a circuit that may not be detected using an ohmmeter.