100+ Free ASE H6 Electrical/Electronic Systems (Transit Bus) Practice Questions

Pass your ASE H6 — Electrical/Electronic Systems (Transit Bus) Certification exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

1 / 100

Question 1

Score: 0/0

A maintenance-free AGM battery should be tested for state of health using:

A tachometer

An electronic conductance/load tester and an open-circuit voltage reading

A hydrometer to read specific gravity of each cell

Only a visual inspection of the case

to track

Same family resources

Explore More ASE Certifications

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

More From This Family

Videos and articles for deeper review.

VideoASE A1-A8 Certification Guide 2026: Pass First Try VideoASE A1-A8 Certification Guide 2026: Pass First Try VideoASE A1-A8 Certification Guide 2026: Pass First Try VideoASE A1-A8 Certification Guide 2026: Pass First Try ArticleASE A1-A8 Certification Guide 2026: Pass First Try18 min read ArticleASE L1 Exam Guide 2026: Advanced Engine Performance Pass Plan32 min read

2026 Statistics

Key Facts: ASE H6 Electrical/Electronic Systems (Transit Bus) Exam

60 / 50

Total / Scored Questions

ASE Transit Bus test series

90 min

Time Limit

ASE Transit Bus test series

~$59

ASE Registration Fee

ASE registration

32 / 24 / 14 / 14 / 16

Content Area Weighting

ASE H6 content outline

Criterion-referenced

Scoring Method

ASE scoring policy

2 years

Work Experience Requirement

ASE certification requirements

ASE H6 is the Transit Bus Electrical/Electronic Systems certification test. It contains 60 total questions with 50 scored multiple-choice items and a 90-minute time limit, delivered by appointment at Prometric. Scoring is criterion-referenced and set by ASE. Content is weighted roughly 32% General Electrical/Electronic System Diagnosis, 24% Battery & Starting System, 14% Charging System, 14% Lighting Systems, and 16% Related Vehicle Systems, and certification requires documenting two years of relevant work experience.

Sample ASE H6 Electrical/Electronic Systems (Transit Bus) Practice Questions

Try these sample questions to test your ASE H6 Electrical/Electronic Systems (Transit Bus) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A transit bus 24 V accessory circuit draws 3 A through a load with 6 ohms of resistance. Using Ohm's law, what voltage is dropped across that load?

A.18 V

B.12 V

C.6 V

D.24 V

Explanation: Ohm's law states E = I x R. With 3 A flowing through 6 ohms, the voltage drop is 3 x 6 = 18 V. The remaining 6 V is dropped elsewhere in the circuit (wiring, connections, and other series components).

2Technician A says voltage-drop testing is performed with the circuit energized and operating under load. Technician B says a good ground connection should drop more than 0.5 V. Who is correct?

A.Neither A nor B

B.Technician B only

C.Both A and B

D.Technician A only

Explanation: Voltage-drop tests must be done with the circuit live and carrying its normal load current; resistance only matters when current flows. A good ground or connection should drop very little, typically 0.1 V or less, not more than 0.5 V.

3Which meter setting is used to confirm that a relay coil is not internally open before replacing the relay?

A.DC voltage

B.Frequency (Hz)

C.AC current

D.Resistance (ohms)

Explanation: Measuring the coil with the ohmmeter on a de-energized, disconnected relay confirms continuity through the winding. An open coil reads OL (infinite), while a good coil reads a specific low resistance per the manufacturer spec.

4A clamp-style ammeter is the preferred tool for measuring high starter current on a transit bus primarily because it:

A.Must be wired in series with the starter cable

B.Measures resistance more accurately than a DMM

C.Only works on AC circuits

D.Reads current without breaking the circuit

Explanation: An inductive/clamp ammeter senses the magnetic field around a conductor, so it reads current without opening the circuit. This is essential for high-amperage starter and battery cables that a series meter could not safely handle.

5Two 6-ohm resistors are connected in parallel in a body control circuit. What is the total resistance of the parallel combination?

A.2 ohms

B.12 ohms

C.6 ohms

D.3 ohms

Explanation: For two equal resistors in parallel, total resistance equals one resistor divided by two: 6 / 2 = 3 ohms. The general formula 1/Rt = 1/R1 + 1/R2 confirms 1/6 + 1/6 = 2/6, so Rt = 3 ohms.

6When reading a transit bus wiring diagram, a solid line connecting two components that does NOT pass through any connector or splice symbol indicates:

A.A continuous conductor with no intermediate connection

B.A shielded data bus only

C.A chassis ground path

D.An optional accessory circuit

Explanation: On a wiring diagram, a plain line between components represents a continuous wire. Connector, splice, or ground symbols would be shown where the conductor is interrupted or terminated, so their absence means the run is unbroken.

7A bus circuit blows its fuse only when a particular accessory is switched on. The most likely cause is a:

A.Open in the load device

B.High-resistance ground connection

C.Short to ground that completes when the accessory is energized

D.Corroded but functional switch contact

Explanation: A fuse opens from excessive current. If it blows only when the accessory is energized, current is being diverted to ground through a short in that branch, raising current above the fuse rating. The fault must be in the part of the circuit downstream of the switch.

8A 24 V circuit should deliver full voltage to a lamp, but the technician measures 24 V at the source and only 19 V at the lamp with the lamp on. This 5 V loss most directly indicates:

A.A short to ground before the lamp

B.An open ground at the lamp

C.Excessive resistance (voltage drop) in the feed circuit

D.A correctly operating circuit

Explanation: With the lamp drawing current, a 5 V difference between source and load means resistance in the feed path is dropping that voltage. Loose, corroded, or undersized conductors and connections are typical causes; the test must be done under load.

9On a J1939 CAN datalink, the two terminating resistors are each:

A.60 ohms, giving 120 ohms total across the bus

B.12 ohms, giving 24 ohms total across the bus

C.120 ohms, giving 60 ohms total across the bus

D.Open circuits used only for shielding

Explanation: A standard J1939 high-speed CAN bus uses two 120-ohm terminating resistors, one at each end. Because they are effectively in parallel across CAN_H and CAN_L, a meter on a powered-down bus reads about 60 ohms.

10A technician measures resistance across the J1939 bus (key off, modules powered down) and reads about 60 ohms. This indicates:

A.An open in the CAN backbone

B.One terminating resistor is missing

C.A short between CAN_H and CAN_L

D.Both terminating resistors are present and the bus is likely intact

Explanation: Two 120-ohm terminators in parallel produce roughly 60 ohms. A reading near 60 ohms with the network unpowered confirms both terminators are present and there is no obvious open or short in the backbone.

About the ASE H6 Electrical/Electronic Systems (Transit Bus) Exam

ASE H6 — Electrical/Electronic Systems (Transit Bus) is the ASE Transit Bus series certification covering the bus electrical and electronic systems: general electrical/electronic diagnosis, battery and starting systems, charging systems, lighting systems, and related vehicle electrical systems. It is built for transit-bus technicians who diagnose and repair voltage-drop and circuit faults, heavy-duty AGM and series-parallel batteries, starters and charging systems, FMVSS 108 lighting, and multiplexed body controllers communicating over J1939/CAN.

Assessment

50 scored multiple-choice (60 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items

Time Limit

90 minutes

Passing Score

Criterion-referenced (set by ASE)

Exam Fee

~$59 (ASE registration) (ASE (National Institute for Automotive Service Excellence))

ASE H6 Electrical/Electronic Systems (Transit Bus) Exam Content Outline

32%

General Electrical/Electronic System Diagnosis

Ohm's law and series/parallel circuit analysis, voltage-drop testing under load, DMM and clamp-meter technique, wiring-diagram interpretation, relays, solenoids, diodes and spike suppression, parasitic draw, and multiplexed body controllers with J1939/CAN datalink diagnosis.

24%

Battery & Starting System Diagnosis & Repair

Heavy-duty AGM and flooded batteries, state of charge and surface charge, conductance/load testing, CCA, series-parallel battery banks and the series-parallel switch, battery cables and terminals, starter draw, cranking voltage, and starter/solenoid diagnosis.

14%

Charging System Diagnosis & Repair

Alternator operation and electromagnetic induction, voltage regulator and rotor field control, rectifier diodes and AC ripple, output/full-field testing, charging-circuit voltage-drop testing, and datalink-commanded charging on multiplexed transit buses.

14%

Lighting Systems Diagnosis & Repair

Interior and exterior LED and incandescent lighting, headlamps and aiming, turn signals and flasher/LED compatibility, marker and stop lamps, FMVSS 108 compliance, destination signs, and controller-managed lighting outputs.

16%

Related Vehicle Systems Diagnosis & Repair

Low-floor wheelchair ramp and kneeling electrical control and safety interlocks, fareboxes, automatic passenger counters, AVL/telematics datalink interfaces, stop-request circuits, blower and accessory circuits, DC-DC converters, and constant battery-power feeds.

How to Pass the ASE H6 Electrical/Electronic Systems (Transit Bus) Exam

What You Need to Know

Passing score: Criterion-referenced (set by ASE)
Assessment: 50 scored multiple-choice (60 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items
Time limit: 90 minutes
Exam fee: ~$59 (ASE registration)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ASE H6 Electrical/Electronic Systems (Transit Bus) Study Tips from Top Performers

1Weight your study by the blueprint: about a third of your prep should target general electrical/electronic diagnosis, including Ohm's law, voltage-drop testing, and J1939/CAN datalink work.

2Be fluent in voltage-drop testing: always test with the circuit live and under load, and know the rule-of-thumb limits (roughly 0.5 V on the insulated side, even less on grounds).

3Understand series-parallel battery systems: series adds voltage at the same amp-hour capacity, parallel adds capacity at the same voltage, and the series-parallel switch reconfigures for 24 V cranking.

4Practice distinguishing short-to-ground (blows fuses, overcurrent) from high-resistance/open faults (weak or no operation) since the test repeatedly contrasts these symptoms.

5Drill Technician A/Technician B items by evaluating each statement independently before choosing, and verify any Ohm's-law math (E = I x R) carefully.

Frequently Asked Questions

How many questions are on the ASE H6 test?

The ASE H6 Electrical/Electronic Systems (Transit Bus) test has 60 total questions, of which 50 are scored multiple-choice items. The remaining 10 are unscored research questions that ASE uses to develop future tests, so you cannot tell which questions count.

How much time do I get and what does ASE H6 cost?

ASE H6 has a 90-minute time limit. The ASE registration fee for a standard test like H6 is approximately $59; confirm the current amount in your ASE account before paying since fees can change.

What passing score do I need on ASE H6?

ASE tests are criterion-referenced, meaning the passing standard is set by ASE based on the knowledge required to do the work, not a fixed percentage you can look up. ASE notifies you of pass or fail rather than publishing a universal cut percentage for H6.

What content is weighted most heavily on ASE H6?

General Electrical/Electronic System Diagnosis is the largest area at roughly 32% of the test, followed by Battery & Starting at about 24%, Related Vehicle Systems at about 16%, and Charging and Lighting at about 14% each. Spend the most study time on circuit fundamentals, voltage-drop testing, and datalink diagnosis.

Do I need work experience to be ASE certified for H6?

Yes. Passing the H6 test is required, but ASE certification also requires documenting two years of relevant hands-on work experience. Up to one year can be substituted with relevant formal training under ASE's experience requirements.

Where is the ASE H6 test given?

ASE tests, including H6, are delivered by appointment at Prometric test centers. You register through ASE and then schedule a seat at an available Prometric location.

100+ Free ASE H6 Electrical/Electronic Systems (Transit Bus) Practice Questions

ASE H6 Electrical/Electronic Systems (Transit Bus)

Explore More ASE Certifications

ASE L1

ASE A1

ASE A2

ASE A3

ASE A5

ASE A6