Cummins/Onan — ELECTRICAL SCHEMATIC

For these Cummins/Onan models: MDL3, MDL4, MDL6.

Applies to: Cummins Onan Mdl3, Cummins Onan Mdl4, Cummins Onan Mdl6

Procedure

1. Stop engine.
2. Disconnect and if necessary, label wires. Refer to AC control wiring diagram.
3. Remove four screws at corners.
4. Remove old PC board.
5. Install new PC board; secure with four screws.
6. Reconnect wires removed in step 2 at proper terminals. Set voltage as outlined in test (P) “Voltage Adjustment”.

Source: manual:934-0500 Onan MDL3 MDL4 MDL6 Marine Genset Service manual (08-1991).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.