Cummins/Onan — Changing Meter-Lamp Panel
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Be sure to remove AC line voltage from the automatic transfer switch. Otherwise, the transfer switch has high voltages and presents a serious shock hazard.
Procedure
- Open the front door of the cabinet.
- Move operation selector switch to STOP.
- Disconnect the starting battery.
- Remove the AC line voltage from the automatic transfer switch.
- Remove the twist-lock disconnect plug and pull control accessory panel open.
- 400 ampere AT only: remove the one screw from the inside center support for the left cabinet door and open.
- Remove the one screw on top and one screw on bottom from inside the meter-lamp panel flange.
- Swing the meter-lamp panel outward.
- Disconnect the meter-lamp panel wire leads from TB7 and TB8 (if present).
- Remove the four nuts and washers holding the meter-lamp panel on the left wall of the cabinet and remove the meter-lamp panel.
- Mount the new meter-lamp panel on the cabinet using the same four nuts and washers.
- Connect the wire leads as marked, from the meter-lamp panel wiring harness to terminal blocks TB7 and TB8 (if present).
- Close the meter-lamp panel and secure the top and bottom with the two screws from the other meter-lamp panel.
- Close the control accessory panel and reconnect the twist-lock disconnect plug.
- Restore AC line voltage, reconnect starting battery, move selector switch to RMT or NORMAL, close cabinet door.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.