ASE A6 Electrical practice test
The A6 test is the biggest of the A-series — 50 scored questions and 90 minutes — and widely called the hardest. It rewards real circuit reasoning: Ohm’s law, voltage-drop testing, and working through battery, starting, charging, and body-electrical faults.
Windshield wipers work on all speeds, but when switched off they stop immediately wherever they happen to be instead of returning to the base of the windshield. Which is the most likely cause?
How the A6 test works
50 scored questions
+ ~10 unscored research questions
90 minutes
computer-based, at a test center
$62 per test
plus one $34 registration fee per order
Valid 5 years
then a shorter recertification test
ASE does not publish a fixed passing percentage — scores are scaled. Around 65–70% correct is the commonly cited range; aim above 80% in practice so you walk in with margin. The certificate is issued once ASE verifies your required work experience.
What the A6 test covers
The official task list for A6 Electrical/Electronic Systems breaks down into these content areas — the practice bank above draws from all of them:
- General electrical diagnosis — Ohm’s law, series/parallel circuits, voltage drop, and meter use
- Battery — state of charge, load and conductance testing, and parasitic draw
- Starting system — current draw and slow-crank diagnosis
- Charging system — output testing and voltage regulation
- Lighting, gauges, driver information, and body electrical accessories
- Data bus and module communication basics
Frequently asked
- How many questions are on the ASE A6 test?
- The A6 test has 50 scored questions plus about 10 unscored research questions, with a 90-minute time limit — the longest of the A-series.
- How much math is on A6?
- Expect a handful of simple Ohm’s-law and voltage-drop calculations — single-step arithmetic, not algebra. The harder questions are meter-reading interpretations.
- Why is A6 considered the hardest A-series test?
- It covers every electrical system on the vehicle and demands circuit-level reasoning rather than pattern recognition. Solid voltage-drop testing habits are the best preparation.