Correct answer: Logic probe
A logic probe is the only device that measures digital signals.
Correct answer: An open circuit in the driver’s side master control switch
The cause could be an open circuit in the driver’s side master control switch.
Correct answer: Highest resistance contains the highest voltage drop
According to Kirchhoff’s Voltage Law: Voltage higher before resistance than after, which is the result of total applied voltage not equal at both ends of a single load circuit. The resistance opposes electron flow which results in voltage loss applied to the load. This loss is voltage drop with the voltage consumed as current travels through resistance. If you have higher resistance, you have higher drop.
Correct answer: 12.6 volts
The standard is 2.1 volts per cell and 2.1 times 6 is 12.6 volts.
Correct answer: X only
Technician X is correct. The circuit will be unprotected if a fusible link in the alternator charging circuit is replaced with system sized wire.
Correct answer: Across the circuit or component
You want to connect your meter leads across the circuit or component. Voltage always gets checked across the circuit or in parallel. The other answers aren’t the appropriate way to connect meter leads in this situation.
Correct answer: X only
Technician X is correct and Technician Y is wrong because maintenance free batteries do not have openings to check the specific gravity of the electrolyte with a hydrometer.
Correct answer: Both X and Y
Both technicians are correct.
Correct answer: It is open
This ohmmeter is showing infinite resistance or infinity. This is what happens when the needle doesn’t move. With the rotor winding shows, the circuit is open.
Correct answer: Replace the battery
The battery was tested under load and failed.
Correct answer: a failed starter relay
A failed starter relay could not be the cause of high starter current draw.
Correct answer: Both technicians
Both technicians are correct. There’s little or no resistance with a short to ground. It’s also true that the current flow increases when resistance decreases.
Correct answer: Y only
Technician X is wrong because this device cannot apply a load. It checks battery conductance.
Correct answer: an open solenoid hold-in winding
An open solenoid hold-in winding could not be the cause of the problem.
Correct answer: Worn bushings in the starter motor
As the motor turns slower, it draws more amperage. Worn bushings cause the motor to turn slower than it should. This leads to a high current draw.
Correct answer: Both X and Y
Both statements are correct.
Correct answer: X only
Technician X is correct. A ground in the circuit between the indicator light and the pressure switch could be the cause why the oil pressure light stays on whenever the engine is running.
Correct answer: Technician Y
Tech X is incorrect because undercharging is the result of a slipping belt. Tech Y is right because the undersize wiring leads to undercharging. This is caused by higher resistance.
Correct answer: Low battery voltage level
Full fielding removes the regulator from controlling field current allowing the alternator to go to full output and is unlikely to produce a low battery voltage. This action normally produces high current and voltage. P (Power) = I (Current) x E (Voltage) and is least likely to occur.
Correct answer: charging circuit voltage drop
In the charging system shown, the digital multimeter (DMM) will display the charging circuit voltage drop.
Correct answer: Low output from the alternator
All of these reasons could be the cause of a dim headlight but D is the least likely. More common symptoms of a failing alternator are a dead battery, engine stalling, odd noises and the service engine light.
Correct answer: Both X and Y
Both statements are correct.
Correct answer: point X and the negative probe to ground
To find the actual voltage at the bulb, the technician should touch the positive probe of the voltmeter to point X and the negative probe to ground.
Correct answer: Both technicians
Both techs are correct. The incorrect wattage and improperly rated flasher could cause the signal to flash incorrectly. Turn on the signal and inspect it to determine the problem.
Correct answer: Both X and Y
Both statements are correct.
Correct answer: X only
Technician X is right. As shown in the circuit, a failed horn relay could be the cause.
Correct answer: Rosin core
Rosin core is the only solder type to ensure integrity in this repair. It’s specified for use on any electric repair. The other options would be unacceptable ways to perform the repair.
Correct answer: X only
Technician X is correct because the aiming screen is the tool of choice due to the many different headlight designs used. Technician Y is wrong because mechanical aimers are no longer used and were never used on HID headlights.
Correct answer: Wire leading to sending unit ground
While there could be many causes; this is the most likely as the question indicated. It can also cause other symptoms such as erratic readings and stuck on empty as well. The least common cause would be trouble with the instrument panel itself.
A wire to the sending unit being grounded is the most likely cause on most systems.
Correct answer: Copper stranded type
Copper stranded type electrical wiring is the correct answer because the other types are not common.
