Deck 9: Wiring Schematics and Circuit Testing

Question 1

On a wiring diagram, S110 with a ".8 BRN/BLK" means ________.

A) Circuit #.8, spliced under the hood
B) A connector with 0.8 mm 2 wire
C) A splice of a brown with black stripe, wire size being 0.8 mm 2 (18 gauge AWG)
D) Both a and b

Answer 1

Consider on wiring diagram, S110 with ".8BRN/BLK".
The "S" indicates the Splice.
In ".8BRN/BLK", the code BRN indicates brown and BLK indicates black.
In ".8BRN/BLK"., 0.8 is the metric wire gauge size in square millimeters
.
Hence, the options a, b, and d are incorrect.
Hence, S110 with ".8BRN/BLK" means a splice of brown and black strip and the wire size is 0.
.
Therefore, the correct option is
.

Question 2

List the numbers used on schematics to indicate grounds, splices, and connectors and where they are used in the vehicle.

Answer 2

The schematics used to indicate ground, splices and connectors are as follows:
i) Ground is indicated by the letter ' G ' followed by three numbers. These numbers provide the location where they are used.
ii) Splices is indicated by the letter ' S ' followed by three numbers. These numbers provide the location where they are used.
iii) Connectors is indicated by the letter ' C ' followed by three numbers. These numbers provide the location where they are used.
The numbers specified for the location in a vehicle are shown in Table 1.
Table 1

Question 3

Where is connector C250?

A) Under the hood
B) Under the dash
C) In the passenger compartment
D) In the trunk

Answer 3

For a connector the connections are labeled as "C." There are three numbers following C that give the details of location of the connector on the vehicle. The numbers between 200 and 299 are situated under the dash. So the connector C250 is situated under the dash.
Thus, the correct option is
.

Question 4

List and identify the terminals of a typical ISO type relay.

Question 5

All switches illustrated in schematics are ________.

A) Shown in their normal position
B) Always shown in their on position
C) Always shown in their off position
D) Shown in their on position except for lighting switches

Question 6

List three methods that can be used to help locate a short circuit.

Question 7

When testing a relay using an ohmmeter, which two terminals should be touched to measure the coil resistance?

A) 87 and 30
B) 86 and 85
C) 87a and 87
D) 86 and 87

Question 8

How can a tone generator be used to locate a short circuit?

Question 9

Technician A says that a good relay should measure between 60 and 100 ohms across the coil terminals. Technician B says that OL should be displayed on an ohmmeter when touching terminals 30 and 87. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 10

Which relay terminal is the normally closed (N.C.) terminal?

A) 30
B) 85
C) 87
D) 87a

Question 11

Technician A says that there is often more than one circuit being protected by each fuse. Technician B says that more than one circuit often shares a single ground connector. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 12

Two technicians are discussing finding a short-to-ground using a test light. Technician A says that the test light, connected in place of the fuse, will light when the circuit that has the short is disconnected. Technician B says that the test light should be connected to the positive (+) and negative (-) terminals of the battery during this test. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 13

A short circuit can be located using a _______.

A) Test light
B) Gauss gauge
C) Tone generator
D) All of the above

Question 14

For an electrical device to operate, it must have ________.

A) Power and a ground
B) A switch and a fuse
C) A ground and fusible link
D) A relay to transfer the current to the device