Terms for electrical final
As a rule of thumb, for a typical non-PCM-controlled 12-volt charging system, the regulated alternator output voltage should be between_______ volts
Answer: 13.8 and 14.4
The rotating electromagnet is called the
rotor
WHen using non-powered test light o check for power, the clip should be attached to:
Answer:a known good ground
A blown fuse typically has a battery voltage on one side of the fuse and _______ volts on the other side
Answer: 0
Most DMMs can measure MIlliamps or________ directly through the meter
Answer: 10 to 20 amps
In some cases, it may be possible to use a ______ memory minder or memory saver to maintain the vehicle s memory while the vehicles battery is disconnected
Answer: 9-volt
Basic DMM Measure
Answer: All of the above
The solenoid plunger movement allows a very large current flow from the battery to the starter motor____________
Answer: All of the above
______ are available in various ratings, types ,a nd sizes and must always be replaced with the same rating and type
Answer: All of the above
Battery terminals are usually _________ onto the battery cables to ensure strong, low resistance connections
Answer: Both A and B
Once the cranking circuit is completed, current flows from the battery to the
Answer: Both A and B
Tech A Says that the stater solenoid switched the high current on and off Tech B says that the solenoid on the starter motor engages the starter drive with the ring gear
Answer: Both A and B
Two technicians are discussing alternators
Answer: Both A and B
Two technicians are discussing the starter control circuit
Answer: Both A and B
Two techs are discussing a starter draw test
Answer: Both A and B
When reading a DMM you have a reading of 2168 mV
Answer: Both A and B
If voltage decreases and the resistance stays the same, then amperage will
Answer: Decrease
If voltage stays the same but resistance decreases, amperage must
Answer: Increase
It is important to understand that ohms law tells us that flow is ____ to resistance
Answer: Inversely proportional
A starter motor armature has a____ number of conductor loops ad therefore _______ segments on the commutator
Answer: Large;many
The _____ resistance fault causes an abnormally ________ current flow in the circuit and may cause the circuit protection devices, such as fuses or circuit breakers, to______ the circuit
Answer: Low; high; open
Tanks to solid state electronics and circuitry, alternators have taken over due to their superior operating characteristics, including the following except
Answer: Lower RPM
A short typically causes _____ circuit resistance
Answer: Lower than normal
Tech A says that an open circuit will typically higher current flow, which will blow the fuse
Answer: Neither A nor B
Two technicians are discussing voltage regulators
Answer: Neither A nor B
The________ prevents the starter motor from being driving by the engine once the engine starts, which would spin the amrature faster then is could handle
Answer: Overrunning clutch
________ are commonly used in the vehicles electrical system, especially for lights
Answer: Parallel Circuits
Since the heavy contacts are located between the input and the output terminals of the solenoid, where possible, it is best to measure the voltage drop from the __________ to the__________
Answer: Positive battery post; starter motor input
On modern Vehicles, what now controls the voltage regulator
Answer: Powertrain control module (PCM) or body control module (BCM)
The reduction in voltage and current to the load_________ the amount of electrical power to the load affecting its performance
Answer: Reduces
A voltage drop test is being preformed on the output wire of the alternator to the battery positive post
Answer: Tech B
Tech A says that good test of the alternator charging system is ti remove the battery positive cable off the battery post, and see if the engine dies. Tech B says that the practice of removing a battery cale connection while the engine is running can damage the electronics on this vehicle
Answer: Tech B
All of the following are true about parallel circuits , Except
Answer: The sum of the voltage drops across individual resistors is equal to supply voltage
The process of converting alternating current (AC) into direct current (DC) is called
Answer: rectification
Two technicians are discussing the use of a DMM. Technician A States that back-probing is a technique used to reduce the chance of damage while measuring. Technician B states that insulation piercing probes do not increase the chance of corrosion or damage the the conductor
Answer:Tech A
Technician A says when doing a voltage drop test, the voltmeter needs to be set to ohm. Technician B says current has to be flowing to do a voltage drop test. Who is correct?
Answer:Technician B
All these statements are true about protection devices, except
Answer: You should always replace fuses and fusible links with higher rated ones.
A so-called three-phase bridge rectifier has a minimum of_______ to rectify the AC output of the stator windings to DC output from the certifier
Answer: 6 Diodes (3 positive, 3 negative)
The motor effect is greatest when the current-carrying conductor and the stationary magnetic field are at
Answer: 90 degrees
As a voltmeter, the DMM can measure electrical voltage with circuits
Answer: All of the above
Where should you place the voltmeter leads when measuring the voltage drop on the ground side of the alternator
Answer: Black probe on the negative battery terminal and red probe on the case of the alternator
If only one side of the fuse lights the test lamp, then the fuse is
Answer: Blown
A voltage regulator _______, Thus controlling the strength of the magnetic field of rotating magnet
Answer: Both A and B
Each starer test devise will operate slightly differently, but all should have
Answer: Both A and B
Tech A says that the pull-in winding short-circuited when the solenoid is fully engaged. Tech B says that the hold-in winding is used only to ensure that the moving contact continues to bridge the main starter terminals
Answer: Both A and B
Two technicians are discussing a charging output test
Answer: Both A and B
Two technicians are discussing a resistance measurement
Answer: Both A and B
Two techs are discussing a starter draw test where the starter draw current flow was substantially below specifications
Answer: Both A and B
Tech A says that excessive voltage drops reduce current flow in the starter circuit Tech B says that locating voltage drops can be done by pacing the voltmeter leads systematically in the stater circuit to narrow down the circuit to the actual fault
Answer: Both Tech A and B
Reversing the direction of current flow in the conductor will
Answer: Cause the conductor to move in the opposite direction
As the starter motor and engine cranking seed increase, the current draw_______ and quickly ________ ance the engine reaches full cranking speed.
Answer: Decreases stabilizes
The___________ Allow current to flow one way in the rectifier assembly
Answer: Diodes
A relatively small current flows through a ______ to a starter relay that controls a larger current to operate the starter solenoid, which is typically mounted atop the starter motor.
Answer: Either A or B
It is important to remember that the sum of the voltage drops across individual resistors in a series circuit is ______ the supply voltage.
Answer: Equal to
___________ of the brushes are connected directly to the end fram and ground the armature windings via the engine block to the negative battery terminal
Answer: Half
It is important to understand that current ______ in all parts of a properly working series circuit
Answer: Is the same
What causes the charging system warning lamp to go out when the engine starts up
Answer: It turns off because voltage is applied to both sides of the lamp
A fan is either presses or slipped onto the rotor shaft to assist in cooling the rotor and stator winding and
Answer: Rectifier assembly
When doing a voltage drop test, you should do all exept
Answer: Remove the positive battery cable
Protection devises like fuses and fusable links are ______ meaning that if exsessive current flows hey ________
Answer: Sacrificial; will blow ar burn open and to be replaced
The magnetic fields from both winding work together to attract the _________ toward the main starter terminals in the solenoid cap
Answer: Solenoid plunger
The control circuit is made up of all of the following except
Answer: Starter cable
The stationary winding assembly in an alternator is called the
Answer: Stator
The ________ the magnetic field the _____ The alternator output
Answer: Stronger stronger
Tech A says amperage cannot exist without both voltage and resistance
Answer: Tech A
Tech A says test light are great for preforming simple tests. Tech B syas you can use a test light to check SRS circuits and computer Circuits
Answer: Tech A
Tech A says that a slow crank accomplished with high starter draw typically points to high electrical resistance in the starter circuit Tech B says that high starter draw current could be caused by high mechanical resistance from an engine fault such as a seized piston
Answer: Tech A
Tech A says that to read amperage the meter needs to be hoked up in series in a circuit. Tech B says that to read amperage at a load, placeone lead of the ammeter on the mput side of the load and the other lead on the output
Answer: Tech A
Tech A says that when resistance increases, current flow decreases. Tech B says that when voltage decreases, current increases
Answer: Tech A
Tech a says that the voltage regulator controls the strength of the rotor s magnetic field Tech b says that the voltage regulator is installed between the output terminal of the alternator and the positive terminal of the battery
Answer: Tech A
Two technicians are discussing non-powered test lights. Technician A says that the test light should be connected to the batteries + an- terminals to it is operational Technician B says hat the test light turnson if there is a problem in a circuit
Answer: Tech A
Technician A says you can use ohm's law in two ways to help diagnose electrical circuit faults. Technistin B says the first is by using it to preform the math to predict and verify the measurements
Answer: Tech A and B
Tech A says That an ohmmeter is used to measure the amount of current flowing in a circuit. Tech B says that to measure current, the DMM is connected in series with the load
Answer: Tech B
Tech A says that total resistance goes up as more parallel paths are added. Tech b says that total amperage goes up as more parallel pathe are added
Answer: Tech B
Tech A says wiring two resistors in parallel will cause a decrease in a current flow compared to wiring them in series
Answer: Tech B
Technician A says the slip ring and brushes carry the rectified current from the rotor to the output terminal of the alternator. Technician B says Slip rings and brushing aid in making an electrical connection to the rotating rotor assembly
Answer: Tech B
Two technicians are discussing an amperage measurement
Answer: Tech B
Two techs are discussing a higher than normal starter draw result
Answer: Tech B
Two techs are discussing a vehicle's charging system running at 17.2 volts
Answer: Tech B
When testing the voltage drop on the positive side of the starter circuit (High current side), connect the red voltmeter lead to
Answer: The input of the starter motor
Which of the following is incorrect when talking about adding paths or legs in parallel circuits.
Answer: The voltage needs to go up as circuits are added
Which of the following is NOT a law for a parallel circuit?
Answer: Voltage changes at all common parallel circuit inputs.
Knowing the difference between an A- or B- type regulating circuit is necessary in order to properly bypass a _______ when diagnosing some charging systems
Answer: Voltage regulator
The ________monitors battery voltage and varies current flow through the rotor field circuit
Answer: Voltage regulator
When measuring the voltage drop on the ground side of the starter motor connect the red voltmeter lead to
Answer: a good ground on the starter motor housing
Jumper leads are used to extend connections to allow circuit readings or tests to be undertaken with
Answer: any of the above
The revolving component of the starer is the
Answer: armature
When the starter motor starts load
Answer: it draws high current and produces high torque
In addition to recharging the battery the alternator is required to
Answer: supply current to the electrical circuits
When testing the voltage drop on the positive side of the starter the black voltmeter lead should be connected to
Answer: the positive terminal of the battery
When preforming a voltage drop test on a 12V blower motor circuit, the reading 2.7 volts across the fan switch when closed, What is the maximum voltage available at the fan?
Answer:9.3 volts
What is an example open circuit
Answer:A break in the electrical circuit
Resistance measurements should only be taken with powe__________, and ideally, with the component _______, from the circuit.
Answer:Disconnected; disconnected
The min/max setting is often used to measure vehicle battery voltage while:
Answer:Either A or B
Once a reading is obtained, it has to be interpreted and applied, in conjunction with knowledge of____, to diagnose the circuit being tested.
Answer:Electrical theory
What is the first step in setting up a DMM?
Answer:Know what you are testing volts, amps, or ohms
If the amperage is low then you know that one of two conditions is present either the voltage is _____ or the resistance ______.
Answer:Low; high
To achieve the most accurate reading, always selce the ____ range possible for the value being measured
Answer:Lowest
____________ Circuits are found in vehicles, such as in dash light dimer circuits, although they are not as common as _________ Circuits
Answer:Series-parallel;Parallel
It is important to understand that the ______ of the series voltage drops equals the supply voltage, as explained in kirchhoff s voltage law.
Answer:Sum
Technician A says an example of a series- parallel circuit is the dash light dimmer circuit. Technician B says when testing you only need to consider the voltage drop across the parallel branch
Answer:Tech A
When testing for a voltage drop, always have the circuit
Answer:Turned on
