Cummins/Onan — Generator Connections
Installation · AC electrical
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAJ, Cummins/Onan HDKAK
Before you start
- EXHAUST GAS IS DEADLY! Seal all wiring openings into the vehicle interior to keep out exhaust gas.
- Faulty grounding can lead to fire and electrocution, resulting in severe personal injury or death. Grounding must be in accordance with applicable codes.
- Interconnecting the genset and the public utility (or any other power source) can lead to the electrocution of personnel working on the utility lines, damage to equipment and fire. An approved switching device must be used to prevent interconnections.
Procedure
- Have a qualified electrician supervise and inspect the installation of all AC wiring.
- Secure only one lead at each AC output terminal; terminals are suitable for wire sizes up to No. 6 AWG.
- Install vibration-proof switches and controls that won’t open and close circuits when the vehicle is in motion.
- Provide ground fault circuit interrupters (GFCIs) for all convenience power receptacles.
- Route AC wiring, remote control wiring and fuel lines separately.
- Seal all conduit openings into the vehicle interior to keep out exhaust gas; apply silicone rubber or equivalent sealant inside and outside each conduit connector.
- Bond the genset and all connected AC and DC equipment and controls to a common grounding point in accordance with applicable codes.
Tools required
- silicone rubber or equivalent sealant Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- AC terminal wire size: up to No. 6 AWG
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAJ →, Cummins/Onan HDKAK →
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.