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ASE School Bus

S6 School Bus — Electrical / Electronic — practice test

Studying for S6 (School Bus — Electrical / Electronic)? Overhaul Prep has 174 verified S6 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.

174S6 questions
100%with explanations
9,711questions in total
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Sample S6 questions

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

A diesel school bus commonly uses multiple 12-volt batteries connected in what configuration to increase available cranking current?

  1. Series, to raise system voltage to 24 volts
  2. Parallel, to increase current/reserve capacity while staying at 12 volts
  3. Series-parallel, to make 18 volts
  4. Isolated and unconnected to each other
WhyBatteries wired in parallel keep the system at 12 volts while adding cold-cranking amps and reserve capacity needed to crank a diesel.

A battery is being load tested. Technician A says the battery should be loaded to one-half its cold-cranking-amp rating for 15 seconds and must stay above 9.6 volts at 70F. Technician B says the battery must be at least 75% charged for the load test result to be valid.

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyThe standard load test is one-half CCA for 15 seconds with a minimum of 9.6 V at 70F, and the battery must be ~75% charged (about 12.4 V) for a valid result.

With the master switch on and the service door open, the red lamps flash and the front crossing gate deploys, but the stop signal arm does not move. Which is the MOST likely cause?

  1. Open entrance-door switch
  2. Open master warning switch contacts
  3. Open in the stop-arm branch (its circuit breaker, relay, motor, or ground)
  4. Failed alternating flasher module
WhyBecause the reds and the gate both respond, the master switch and door switch inputs are proven good; the fault must lie in the stop arm's own protected branch circuit or actuator.

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