ASE A6 study guide, by weight and by meter

The order: largest areas first

1. Body electrical, 17 questions. Clusters and infotainment, power windows, seats and locks, keyless entry, the immobilizer, airbags, cameras and park assist. Learn to split a module-controlled circuit into input, command and output. Body electrical
2. General diagnosis, 13. The meter skills, parasitic draw, fuses and diodes, schematics, network faults and module programming. Work it alongside body electrical: body questions are diagnosis questions on body circuits. General diagnosis
3. Battery and starting, 9. Battery tests, starter draw, cable voltage drop, and electrical versus mechanical slow crank. Battery and starting
4. Lighting, 6. HID, LED and adaptive headlamps, aiming, turn signals and trailer wiring. Lighting
5. Charging, 5. Output tests, ripple and module-controlled generators. Small, but it reuses the voltage-drop skill from general diagnosis and battery and starting. Charging

The meter toolkit

Know what each of these readings means and the diagnosis questions in every area get shorter:

• Available voltage vs. voltage drop. One lead to ground shows what reaches that point; both leads across a part show what it uses. Across a closed switch or a good connection the reading should be close to 0 V; across an open in a powered series circuit it is close to source voltage.
• Voltage drop, not resistance, for high-resistance faults. Measure with current flowing. An ohmmeter on a dead circuit can show a good reading on a cable end that loses volts under load.
• Amps, milliamps, microamps. 1 A = 1,000 mA = 1,000,000 µA. The study guide includes a sample on this conversion.
• Current. An inductive clamp for starter and charging current; an ammeter in series for key-off drain.
• Ohm's law and watts. Amps = watts ÷ volts: a 55 W lamp on 12 V draws about 4.6 A. Loads added in parallel lower total resistance and raise current.
• Waveforms. A lab scope shows what a meter averages away: generator ripple, a network signal pulled low, a dropout.
• Scan tool and bidirectional control. Command a relay, motor or lamp to split a fault into the module side and the wiring-and-load side.

What older prep material misses

No change from the 2025 guide: same 50 scored questions, areas and task list, so the 2025 guide is still current. The gap is with older third-party material. The current task list includes:

• Data-bus networks: identify the network type and diagnose communication failures.
• Module work: swapping a control module, then programming, coding or initializing it.
• Low-voltage energy storage: non-traditional battery chemistry, multi-battery setups and boost capacitors, not just one lead-acid battery.
• Driver aids and telematics in body electrical: collision mitigation, park assist, cameras, head-up display.

Check a book or course against the five areas in the 2026 guide. A list with separate battery and starting areas, or a separate gauges area, does not match it.

Using the practice questions

Take the practice test cold and count misses by area. Then work the areas in the order above, starting with the heaviest one you missed in. Read the note on every option, not just the right one: on a diagnosis question the wrong options are real faults too, and the note says which reading would have pointed to each. Before test day, time one full run at 90 min for 60 questions.

More on this test

• ASE A6 →Format, the five content areas and what makes the electrical test different
• ASE A6 practice test →Questions from all five electrical areas, every option explained
• ASE A6 exam facts →Format, passing score, results, retakes and recertification, sourced
• ASE A6 cost →A6 alone, a retake, A6 with A8 in one order, and keeping A6 current
• ASE A6 wiring diagrams →Symbols, and reading a schematic to find an open, a short or high resistance