When using DC external power for the start, what must be true about the BATT RLY 2 OPEN light?

• A. The BATT RLY 2 OPEN light is ON
• B. The BATT RLY 2 OPEN light is OFF
• C. The BATT RLY 2 OPEN light has EXTINGUISHED
• D. The BATT RLY 2 OPEN light is FLASHING

Answer: (C)

When you start with DC external power, the system uses the external source to feed the start circuit and you do not want the battery path to be ambiguously indicated as open. The BATT RLY 2 OPEN light shows when Battery Relay 2 is open (battery isolated from the bus). For an external power start to proceed cleanly, that relay should not be shown as open, so the indicator must be extinguished. If the light were on, it would signal that Battery Relay 2 is open and the battery is isolated, which is not the desired state during an external start. A flashing light would typically indicate a fault or transient condition, not the normal start condition. Therefore, extinguished is the correct state.