Workshop reference
What are you testing?
Start from the system that is playing up. Every guide gives the meter setting, exactly where the red and black go, the reading you should see and what a bad one means.
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All procedures
58 tests indexed, 8 with a full step-by-step procedure and interactive bench.
Open the full libraryNeed a refresher?
Volts, amps, resistance and voltage drop explained with interactive vehicle maths — read it before or after the test.
Electrical fundamentals