Cummins/Onan — Connecting to Vehicle Systems
Installation · fuel, AC and DC connections
From a Cummins/Onan service manual covering: 2.0 KV, 2.3 KV, 2.5 KV, 2.8 KV. Check it applies to your exact model before use.
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Before you start
- Do not connect the battery cables to the genset starting battery until instructed to in the Initial Start and Checks section.
Procedure
- Route the fuel line separate from electrical wires or separate them with conduit or other sheathing.
- Gasoline sets: connect 1/4-inch I.D. SAE 30-R7 fuel hose to the barb fitting and secure with a stainless steel worm-gear clamp.
- LPG sets: use 1/2-inch I.D. fuel line and a 1/4-inch NPTF thread pipe fitting; LP vapor at 11 inches of water column.
- Install a listed 1/2-inch flexible conduit over the AC wiring and secure it to the fitting on the genset.
- Connect the battery positive (+) cable to the wiring harness B+ connection and cover with the terminal boot.
- Connect the battery negative (–) cable to a genset mounting hole using star (EIT) washers.
- Connect the remote control harness connector to the mating connector on the left side of the genset.
Specs & values
- Gasoline fuel hose type SAE 30-R7, 1/4-inch FridayParts $29.12 I.D.
- LPG fuel line 1/2-inch FridayParts $37.68 I.D., 1/4-inch FridayParts $29.12 NPTF fitting
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.