| Battery | Standard specific gravity | 1.25 to 1.29 at 20°C (68°F) |
| Standard voltage | 12.6 to 12.8 V at 20°C (68°F) | |
| Fuse | Standard resistance | Below 1 Ω |
| Charging circuit without load | Standard current | 10 A or higher |
| Standard voltage | 13.2 to 14.8 V | |
| Charging circuit with load | Standard current | 30 A or higher |
| Brush length | Standard exposed brush length | 10 to 11 mm (0.394 to 0.433 in.) |
| Minimum exposed brush length | 1.9 mm (0.0748 in.) |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Slip ring - Slip ring | Approx. 20°C (68°F) | 2.0 to 2.2 Ω |
| Slip ring - Rotor | Always | 10 MΩ or higher |
| Slip ring diameter | Standard diameter | 14.2 to 14.4 mm (0.559 to 0.567 in.) |
| Minimum diameter | 13 mm (0.512 in.) |