Electrical
Automotive Wiring Diagrams
Explore common automotive wiring diagrams including relay circuits, lighting systems, accessory wiring, and trailer wiring.
Relay Wiring
Understanding terminals 30, 85, 86, 87 and how relay circuits work.
Trailer Wiring
Learn trailer light wiring for brake lights, turn signals, and grounds.
Starter System
Battery → relay → starter motor. Diagnose no-crank, slow crank, and voltage drop issues.
Sensor Circuit
Understand 5V reference, ground, and signal wires used by many common automotive sensors.
5-Pin Relay
Understand pins 30, 85, 86, 87, and 87a and how relay switching works.
Sensor Circuit
Learn the common 5V reference, ground, and signal pattern used by many sensors.