Electrical Diagnostics

Meter use, voltage drop, opens, shorts and amperage tests.

Lessons

1. 01Measuring Voltage & AmperageWhere to put the meter and what's normal.
2. 02Voltage Drop TestingFind hidden resistance in grounds and feed wires under load.
3. 03Finding Opens & ShortsContinuity checks, isolating a short to ground, and blown fuse diagnosis.
4. 04Brake Circuit Amperage TestingUse current draw to diagnose electric brake magnets.
5. 05Circuit Layout and Wire SelectionIdentify the connector orientation, brake-current path, and applicable wire-size requirements before diagnosing electrical performance.
6. 06Controller Modulation and Magnet VoltageEvaluate controller behavior and voltage at the magnets without confusing excessive threshold voltage with a mechanical brake defect.
7. 07System and Individual Magnet CurrentMeasure total and individual current under the documented conditions and compare results with the correct brake-size chart.
8. 08Low Output, Intermittent Faults, and Short IsolationUse current behavior and sectional isolation to distinguish poor connections, open circuits, and trailer wiring shorts.
9. 09Correlating Electrical Tests with Brake ConditionEvaluate magnet wear, lining condition, and the mechanical actuation path alongside electrical test results.
10. 10Electrohydraulic Supply and Breakaway DiagnosisUse the documented supply and breakaway checks to distinguish control-path faults from electrohydraulic actuator faults.