Cummins/Onan Energy Command 20 — Preparing to Mount the EC-20
Installation · EC-20 controller
For the Cummins/Onan Energy Command 20, from the Cummins/Onan service manual.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKB, Cummins/Onan HDKC
Procedure
- Select a visible location where the unit can be easily operated, using the mounting template.
- Check the backside (inside) of the location for interference with drilling, fasteners, harness plug, or enclosure.
- Verify control wire routing meets national and local codes; protect wires from hot, sharp, abrasive surfaces.
- Cut out the template and tape it square/level to the mounting surface.
- Center-punch marks through the template for each fastener and cutout perimeter.
- Remove the template.
- Drill cutout starter holes at the four corners, cut between them, and remove the cutout.
- Drill 1/8-inch diameter holes for the control panel fastening screws.
- Do not mount until wiring is complete.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 1/8-inch diameter holes for control panel fastening screws
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKB →, Cummins/Onan HDKC →
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.