Exam 16: General Electrical System Diagnostics and Service

How does an inductive amps probe measure current without touching any wires in the circuit?

The wiring harness for the SIR [air bag] circuit has a _____ harness cover.

A conventional ammeter is always connected in ____________________ with the circuit.

Technician A says electrical circuit resistance causes voltage drop. Technician B says high-resistance problems cause an increase in current flow. Who is correct?

High resistance in a circuit causes decreased current flow.

Taking electrical measurements from the external wire terminal ends on the outside of a plugged-in electrical connector is called ____________________.

Explain how you would bench test a relay [the relay is removed from the vehicle].

Duty cycle is measured in ____________________.

The most common way to check a variable resistor is with a(n) ____________________.

Other than measure voltage, current and resistance most DMMs [DVOMs] can also measure and test what other factors?

When using a DMM to test resistance, the red lead is connected to the A jack.

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

You are wiring a vehicle for a trailer hitch. The trailer will have eight parking lamps. Each parking lamp uses a 6 watt light bulb. What size fuse should be used to supply power for the parking lamp circuit? [Assume that the normal operating voltage is 14 volts.]

The black DMM test lead always plugs into the COM input jack.

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

Resistance checks are being discussed. Technician A says the component must be disconnected from the system before checking. Technician B says an infinite reading means the component is shorted. Who is correct?

A technician is diagnosing the cause of an insufficient heat problem. He notices the fan is working but not providing much air flow. He disconnects the fan power feed wire and connects the fan to the battery using a fused jumper wire. The specification for the fan motor is 16 amps. His ammeter shows 26 amps when the fan is jumped directly to the battery. What could be the problem?

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

The voltage specification for a wheel speed sensor is 3.5 to 6.0 VAC RMS ± 0.5/20 MPH. What does RMS stand for? ____________________

What is a short circuit?