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ASE Transit Bus

H6 Transit Bus — Electrical / Electronic — practice test

Studying for H6 (Transit Bus — Electrical / Electronic)? Overhaul Prep has 157 verified H6 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

157H6 questions
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9,711questions in total
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Sample H6 questions

Straight from the bank — answers highlighted, with the explanation underneath.

A fully charged 12-volt flooded lead-acid battery that has been at rest reads approximately what open-circuit (no-load) voltage?

  1. 11.9 V
  2. 12.2 V
  3. 12.6 V
  4. 13.8 V
WhyA fully charged 12V battery at rest reads about 12.6-12.7V; ~12.2V is about 50% charged and ~11.9V is discharged. Readings of 13.8V or higher only occur with a charger or alternator connected.

Technician A says an open-circuit voltage of 12.4 V indicates a battery that is about 75% charged. Technician B says a surface charge should be removed before taking an accurate open-circuit reading.

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyAbout 12.6V is 100%, 12.4V is roughly 75%, and 12.2V about 50%; a surface charge falsely raises the reading, so it should be removed (a brief load) before measuring. Both are correct.

A transit bus's batteries are found dead each morning after sitting overnight, but they charge and test fine during the day. The MOST likely cause is:

  1. a slipping alternator belt
  2. an excessive key-off (parasitic) current draw
  3. undersized battery cables
  4. high resistance in the starter ground
WhyOvernight discharge with normal daytime operation points to a parasitic drain, a module or circuit that fails to shut off, rather than a charging or cranking-path fault.

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