Electrical Systems Flashcards
7 cards from real ASE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Systems flashcards as text
With the battery disconnected, resistance measured between CAN-High and CAN-Low at the DLC should typically be about:
Answer: 60 ohms
Two 120-ohm terminating resistors in parallel produce about 60 ohms across the bus.
Which American Wire Gauge (AWG) size can safely carry the most current?
Answer: 10 AWG
In the AWG system, a smaller number means a larger-diameter wire with greater current capacity.
How does a typical power window circuit make the motor run in the opposite direction?
Answer: By reversing the polarity applied to the motor
The window switch reverses polarity to the permanent-magnet motor to change its direction.
The starter solenoid clicks but the engine does not crank, and battery voltage is 12.6 V. What should be checked next?
Answer: Voltage drop across the solenoid contacts and starter circuit
A click without cranking often means burned solenoid contacts or high resistance in the starter circuit, found with a voltage drop test.
What is the typical regulated charging voltage range for a 12-volt system at the battery with the engine running?
Answer: 13.5 to 14.5 V
Most charging systems regulate between roughly 13.5 and 14.5 V depending on temperature and load.
What type of signal does a typical Hall-effect sensor produce?
Answer: A digital on/off square wave
Hall-effect sensors switch on and off, producing a digital square wave signal.
A vehicle's horn sounds continuously and will not stop. Which is the most likely cause?
Answer: A stuck horn relay or shorted horn switch
A relay with welded contacts or a shorted switch keeps the horn circuit energized constantly.