Automotive A6 ASE Study Guide & Practice with complete verified solutions 2024

Worn starter bushings result in? High Current Draw Worn starter brushes result in? Increased starter resistance Defective voltage regulator results in? A defective voltage regulator can cause overcharging and possible battery boil-over. Voltage regulators can be located in the alternator or in the engine control module depending on the application. What does a low battery electrolyte level indicate? Overcharging A loose alternator belt results in? Undercharging The cause of the low alternator output could be: A shorted diode in the alternator. (Remember 1/3) A faulty rectifier bridge results in? Excessive key-off battery drain. If a diode shorts out in the rectifier bridge in the alternator then, Electrical current can flow from the battery into the alternator and cause the battery to discharge. A compressor clutch coil can be checked for shorts by measuring: The coil of an A/C compressor clutch is a low-resistance, high-current device. An ammeter is used to measure its required current. Higher-than-normal current can be caused by an electrical short. What could cause both headlights become considerably brighter? High charging system voltage What is the maximum voltage and temperature of a battery that is charging? 15.5V and 125 degrees F (51.6 degrees C) What conditions can cause a slow crank? Low battery state of charge, over advanced ignition timing, misaligned starter mounting. When performing a voltage drop test on the negative (ground) side of the starter circuit, a reading of 1.5 volts is obtained. All of the following could cause this result EXCEPT: -a corroded negative battery terminal. -a loose ground connection at the motor. -high resistance in the starter field windings. -an improperly mounted starter. High resistance in the starter field windings. (High resistance in the starter field windings would not affect the measured voltage drop on the ground side of the starter, although it would affect starter operation.) What conditions of the fuel sending unit could cause the gauge to read high? A corroded connection would increase the resistance in the fuel gauge circuit, which would cause the electromagnetic gauge to read higher. A grounded connection would reduce the electrical resistance, which would cause the bimetallic gauge to read higher. Battery Load Tests The battery load test should be performed at half the cold cranking amps (CCA) rating of the battery. The driver's power window moves very slowly and the window switch must be pressed several times to open or close the window. All of these could cause this problem except: -A faulty circuit breaker -A binding window gasket -A binding window regulator -An open in the window switch An open in the window switch A vehicles battery is being tested for capacity. Technician a says during a battery capacity test the voltage should not drop below 9.6 V at 70°F. Technician B says a battery voltage reading should increase as temperature decreases. Who is correct? A only An alternator output test is being performed on a vehicle's charging system. Tech A says engine idle must be increased during this test. Tech B says the vehicle's accessories must be turned on during this test. Who is correct? Both A and B A technician replaces a blown fuse in a dome light circuit and the element in the fuse melts immediately. Technician a says if a dome light keeps blowing fuses to check for a short to ground. Technician B says resistance in this circuit has increased current flow. Who is correct? A only A vehicle's engine is slow cranking. The battery has 12.6V and is in good condition. A voltage drop test is performed to test the starter circuit. Technician A says the test result above indicates there is excessive resistance in this circuit. Technician B says the ignition must be disabled and the starter cranked in order to perform this test. Who is correct? A only The following could cause high starter current draw, EXCEPT: -a seized A/C compressor -worn starter bushings -a failed starter relay -grounded field coils A failed starter relay. A low-output alternator is being full-fielded to determine the cause. Which of the following is the LEAST likely result of full-fielding the alternator? -Low battery voltage level -High alternator amperage output -High battery voltage level -Battery gassing 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 pr