HEAVY TRUCK ELECTRICAL MICHIGAN
MECHANIC STUDY GUIDE
THE BATTERY IS CONTINUOUSLY OVERCHARGED. WHAT WILL CAUSE THIS
PROBLEM? CORRECT ANSWERS A. A DEFECTIVE REGULATOR OR
ALTERNATOR. (CORRECT AWNSER)
B. A WORN OR DAMAGED BATTERY.
C. A GROUNDED INDICATOR LIGHT.
D. ALL OF THE ABOVE.
TO CHECK RESISTANCE IN THE STARTER CIRCUIT, YOU WOULD CONNECT THE
NEGATIVE LEAD OF THE VOLT METER TO THE NEGATIVE POST OF THE
BATTERY AND THE POSITIVE LEAD OF THE VOLT METER TO: CORRECT
ANSWERS A. THE STARTER FRAME. (POSSIBLE CORRECT AWNSER)
B. THE STARTER RELAY TERMINAL. (NOT CORRECT AWNSER)
C. THE BATTERY TERMINAL ON THE SOLENOID. (NOT CORRECT AWNSER)
D. THE POSITIVE POST OF THE BATTERY.
REFER TO THE WINDSHIELD WIPER CIRCUIT IN THE IMAGE. BOTH HIGH AND
LOW SPEEDS WORK OKAY. THE WIPERS DO NOT PARK PROPERLY BUT STOP
AS SOON AS THE DASH SWITCH IS OFF. THIS IS LIKELY DUE TO: CORRECT
ANSWERS A. AN OPEN CIRCUIT AT POINT A.
B. AN OPEN CIRCUIT AT POINT B.
C. A SHORT CIRCUIT TO GROUND AT POINT C. (NOT CORRECT AWNSER)
D. A BAD GROUND AT THE DASH SWITCH D. (NOT CORRECT AWNSER)
WITH A SEVEN WIRE ELECTRICAL CONNECTION, THE WHITE WIRE WILL MOST
LIKELY BE FOR THE: CORRECT ANSWERS A. BRAKE LIGHT CIRCUIT.
B. TAILLIGHT CIRCUIT.
C. TURN SIGNAL CIRCUIT. (NOT CORRECT AWNSER)
D. GROUND CIRCUIT. (CORRECT AWNSER)
A MECHANIC IS TAKING A BATTERY CELL HYDROMETER READING. TO BE
ACCURATE THE MECHANIC MUST CORRECT THE BULB READING FOR:
CORRECT ANSWERS A. HIGH LOAD TEST FACTOR.
B. ELECTROLYTE TEMPERATURE. (CORRECT AWNSER)
C. SIZE OF THE BATTERY. (NOT CORRECT AWNSER)
D. ATMOSPHERIC PRESSURE.
, NONE OF THE BRAKE LAMPS WORK. THE FUSE IS OKAY AND THE TAIL LAMPS
WORK. WHEN YOU TURN ON THE HAZZARD FLASHER, THE REAR LIGHTS DO
NOT FLASH. WHAT IS THE LIKELY CAUSE OF THE PROBLEM? CORRECT
ANSWERS A. A BAD TURN SIGNAL FLASHER.
B. A BAD TAIL LAMP GROUND.
C. A BAD TURN SIGNAL SWITCH. (CORRECT AWNSER)
D. A BAD HEADLIGHT SWITCH.
THE ILLUSTRATION BELOW SHOWS THE CIRCUIT OF AN: CORRECT ANSWERS
A. ALTERNATOR WITH SOLID-STATE REGULATOR. (CORRECT AWNSER)
B. ELECTRONIC IGNITION SYSTEM. (NOT CORRECT AWNSER)
C. EFI (ELECTRONIC FUEL INJECTION) LOGIC UNIT.
D. AUTOMATIC SPEED CONTROL.
IN THE ILLUSTRATION BELOW, PARTIAL LOSS OF OUTPUT WOULD BE CAUSE
BY: CORRECT ANSWERS A. A GROUNDED CIRCUIT AT POINT A.
B. A SHORT CIRCUIT AT POINT C. (CORRECT AWNSER)
C. AN OPEN CIRCUIT AT POINT A.
D. AN OPEN CIRCUIT AT POINT E.
A LAMP IS NOT AS BRIGHT AS IT SHOULD BE, YET A TEST LIGHT "BURNS" AT
NORMAL BRIGHTNESS WHEN PLACED IN THE CIRCUIT AS SHOWN BELOW.
WHAT IS THE REASON FOR THIS? CORRECT ANSWERS A. AN OPEN IN THE
FEED CIRCUIT.
B. THE LAMP BULB IS DEFECTIVE.
C. SYSTEM VOLTAGE IS LOW.
D. THE LAMP HAS A POOR GROUND. (CORRECT AWNSER)
THE TRAILER CLEARANCE LIGHTS BLINK OFF AND ON CONTINUOUSLY. WHAT
COULD CAUSE THIS? CORRECT ANSWERS A. A SHORT TO GROUND IN THE
LIGHT CIRCUIT.
B. A BAD CIRCUIT BREAKER.
C. AN OPEN IN THE CLEARANCE LIGHT CIRCUIT.
D. BOTH A AND B. (CORRECT AWNSER)
A TRUCK HAS A HISTORY OF LOW BATTERY CHARGE AND HARD STARTING.
THE SPECIFIC GRAVITY OF THE ELECTROLYTE VARIES BETWEEN CELLS FROM
1.180 TO 1.250 AFTER OVERNIGHT SLOW CHARGING. WHAT SHOULD YOU DO
TO CORRECT THE PROBLEM? CORRECT ANSWERS A. INSTALL A HEAVY-
DUTY ALTERNATOR.
B. REPLACE THE BATTERY AND CHECK THE CHARGING SYSTEM. (CORRECT
AWNSER)
C. ADD FRESH BATTERY ACID TO BALANCE ALL THE CELLS.
D. ADJUST THE VOLTAGE REGULATOR TO 12.5 VOLTS.
MECHANIC STUDY GUIDE
THE BATTERY IS CONTINUOUSLY OVERCHARGED. WHAT WILL CAUSE THIS
PROBLEM? CORRECT ANSWERS A. A DEFECTIVE REGULATOR OR
ALTERNATOR. (CORRECT AWNSER)
B. A WORN OR DAMAGED BATTERY.
C. A GROUNDED INDICATOR LIGHT.
D. ALL OF THE ABOVE.
TO CHECK RESISTANCE IN THE STARTER CIRCUIT, YOU WOULD CONNECT THE
NEGATIVE LEAD OF THE VOLT METER TO THE NEGATIVE POST OF THE
BATTERY AND THE POSITIVE LEAD OF THE VOLT METER TO: CORRECT
ANSWERS A. THE STARTER FRAME. (POSSIBLE CORRECT AWNSER)
B. THE STARTER RELAY TERMINAL. (NOT CORRECT AWNSER)
C. THE BATTERY TERMINAL ON THE SOLENOID. (NOT CORRECT AWNSER)
D. THE POSITIVE POST OF THE BATTERY.
REFER TO THE WINDSHIELD WIPER CIRCUIT IN THE IMAGE. BOTH HIGH AND
LOW SPEEDS WORK OKAY. THE WIPERS DO NOT PARK PROPERLY BUT STOP
AS SOON AS THE DASH SWITCH IS OFF. THIS IS LIKELY DUE TO: CORRECT
ANSWERS A. AN OPEN CIRCUIT AT POINT A.
B. AN OPEN CIRCUIT AT POINT B.
C. A SHORT CIRCUIT TO GROUND AT POINT C. (NOT CORRECT AWNSER)
D. A BAD GROUND AT THE DASH SWITCH D. (NOT CORRECT AWNSER)
WITH A SEVEN WIRE ELECTRICAL CONNECTION, THE WHITE WIRE WILL MOST
LIKELY BE FOR THE: CORRECT ANSWERS A. BRAKE LIGHT CIRCUIT.
B. TAILLIGHT CIRCUIT.
C. TURN SIGNAL CIRCUIT. (NOT CORRECT AWNSER)
D. GROUND CIRCUIT. (CORRECT AWNSER)
A MECHANIC IS TAKING A BATTERY CELL HYDROMETER READING. TO BE
ACCURATE THE MECHANIC MUST CORRECT THE BULB READING FOR:
CORRECT ANSWERS A. HIGH LOAD TEST FACTOR.
B. ELECTROLYTE TEMPERATURE. (CORRECT AWNSER)
C. SIZE OF THE BATTERY. (NOT CORRECT AWNSER)
D. ATMOSPHERIC PRESSURE.
, NONE OF THE BRAKE LAMPS WORK. THE FUSE IS OKAY AND THE TAIL LAMPS
WORK. WHEN YOU TURN ON THE HAZZARD FLASHER, THE REAR LIGHTS DO
NOT FLASH. WHAT IS THE LIKELY CAUSE OF THE PROBLEM? CORRECT
ANSWERS A. A BAD TURN SIGNAL FLASHER.
B. A BAD TAIL LAMP GROUND.
C. A BAD TURN SIGNAL SWITCH. (CORRECT AWNSER)
D. A BAD HEADLIGHT SWITCH.
THE ILLUSTRATION BELOW SHOWS THE CIRCUIT OF AN: CORRECT ANSWERS
A. ALTERNATOR WITH SOLID-STATE REGULATOR. (CORRECT AWNSER)
B. ELECTRONIC IGNITION SYSTEM. (NOT CORRECT AWNSER)
C. EFI (ELECTRONIC FUEL INJECTION) LOGIC UNIT.
D. AUTOMATIC SPEED CONTROL.
IN THE ILLUSTRATION BELOW, PARTIAL LOSS OF OUTPUT WOULD BE CAUSE
BY: CORRECT ANSWERS A. A GROUNDED CIRCUIT AT POINT A.
B. A SHORT CIRCUIT AT POINT C. (CORRECT AWNSER)
C. AN OPEN CIRCUIT AT POINT A.
D. AN OPEN CIRCUIT AT POINT E.
A LAMP IS NOT AS BRIGHT AS IT SHOULD BE, YET A TEST LIGHT "BURNS" AT
NORMAL BRIGHTNESS WHEN PLACED IN THE CIRCUIT AS SHOWN BELOW.
WHAT IS THE REASON FOR THIS? CORRECT ANSWERS A. AN OPEN IN THE
FEED CIRCUIT.
B. THE LAMP BULB IS DEFECTIVE.
C. SYSTEM VOLTAGE IS LOW.
D. THE LAMP HAS A POOR GROUND. (CORRECT AWNSER)
THE TRAILER CLEARANCE LIGHTS BLINK OFF AND ON CONTINUOUSLY. WHAT
COULD CAUSE THIS? CORRECT ANSWERS A. A SHORT TO GROUND IN THE
LIGHT CIRCUIT.
B. A BAD CIRCUIT BREAKER.
C. AN OPEN IN THE CLEARANCE LIGHT CIRCUIT.
D. BOTH A AND B. (CORRECT AWNSER)
A TRUCK HAS A HISTORY OF LOW BATTERY CHARGE AND HARD STARTING.
THE SPECIFIC GRAVITY OF THE ELECTROLYTE VARIES BETWEEN CELLS FROM
1.180 TO 1.250 AFTER OVERNIGHT SLOW CHARGING. WHAT SHOULD YOU DO
TO CORRECT THE PROBLEM? CORRECT ANSWERS A. INSTALL A HEAVY-
DUTY ALTERNATOR.
B. REPLACE THE BATTERY AND CHECK THE CHARGING SYSTEM. (CORRECT
AWNSER)
C. ADD FRESH BATTERY ACID TO BALANCE ALL THE CELLS.
D. ADJUST THE VOLTAGE REGULATOR TO 12.5 VOLTS.
