Terminals 3 (Blue) and 4 (Blue) typically serve as the power input terminals for the AVR itself.
| Problem | Likely Cause | Check in Diagram | | :--- | :--- | :--- | | No output voltage | Blown fuse on E1/E2 or S1/S2 | Locate fuse holder symbols; check continuity. | | High voltage (300V+) | Sensing circuit open (S1/S2 not connected) | Verify all sensing wires are tight. | | Low voltage under load | Loose F+ or F- connection | Check field wiring; measure field resistance. | | Voltage hunts (oscillates) | External pot wired incorrectly | Verify A+ and A- wiring; check for shorted wires. | | Voltage drops at high RPM | Wrong frequency jumper (60Hz running at 50Hz setting) | Set J1 correctly per the diagram. | an-5-203 avr wiring diagram pdf
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