Practice question

A school bus uses a heavy-duty starter relay in the start control circuit primarily to:

  1. Increase alternator output
  2. Reduce current load on the ignition switch contacts
  3. Filter J1939 datalink noise
  4. Provide reverse-polarity protection only

Answer: B — Reduce current load on the ignition switch contacts

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Practice more: ASE S6 Electrical Electronic Systems (School Bus) Practice Questions - ASE S6 - Electrical Electronic Systems (School Bus) Certification Exam →