Wiring, Lighting & Electrical Basics

Connector pinouts and common wiring faults.

Lessons

1. 017-Way and 9-Way Color CodesDexter standard terminal assignments.
2. 02Common Wiring FaultsIntermittent, weak and one-sided symptoms.
3. 03Read Connector and Lighting DiagramsIdentify lighting, brake, charging, and ground circuits by reading the applicable connector diagram and its viewing direction.
4. 04Select Wire Size and Protect ConnectionsUse the applicable wire-size chart and recognize how damaged or corroded connections reduce brake performance.
5. 05Understand Electric Brake and Controller ActionFollow how controller current produces braking force and why modulation and synchronization matter.
6. 06Measure Voltage at the Brake MagnetsConnect a voltmeter at the magnet leads and evaluate the gradual rise in voltage as the controller is actuated.
7. 07Measure System and Individual Magnet CurrentUse an ammeter in series and compare current readings with the chart for the installed brakes.
8. 08Isolate Low-Current and Short-Circuit FaultsStart at the controller and use symptoms and circuit isolation to locate electrical brake faults.
9. 09Check Breakaway Readiness and Trailer LightsInclude battery charge, breakaway operation, connector security, lights, and brake engagement in readiness checks.
10. 10Recognize ABS Electrical and Harness BasicsIdentify ABS electrical functions, read harness orientation notes, and use diagnostic codes without assuming all braking functions are lost.