What is an Auto Transformer? - Circuit Globe An Auto transformer works as a voltage regulator. Contents: Explanation of Auto Transformer with Circuit Diagram; Explanation of Auto Transformer with Circuit Diagram. In an ordinary transformer, the primary and the secondary windings are electrically insulated from each other but connected magnetically as shown in the figure below. While 2008 EZGO Guide – Specs | Price | Manual | Wiring Diagram 2008 EZGO wiring diagram. Locking up of auto-brake or dragging friction disc; Brake cable out of adjustment; Defective solenoid; Heated up brake resistor . Faulty relay switch or voltage regulator . Check all cable connections to ensure that they are tight and in place. Tighten up loose ones and connect those that have no connections.