Cummins/Onan — Starting Battery Connections
Installation · Electrical system
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKC, Cummins/Onan HDKCA, Cummins/Onan HDKCB
Before you start
- Accidental starting can cause severe personal injury or death
- Arcing can ignite explosive battery hydrogen gas
Procedure
- Size battery cables per Battery Cable Sizes table
- Coat all battery cable connections with battery terminal oxidation inhibitor
- Terminate battery cables with ring terminals sized for 5/16 inch screws
- Secure insulating boot on positive (+) terminal, tie to cable with tie-wrap
- Torque positive (+) cable terminal to 9-12 Nm (7-9 ft-lbs)
- Torque negative (-) cable terminal to 9-12 Nm (7-9 ft-lbs)
- Connect battery cables to battery, positive (+) cable first, only after installation review checklist is complete
Specs & values
- Battery cable size: 0-25 ft = 0 AWG, 26-70 ft = 00 AWG, 73-90 FridayParts $46.99 ft = 000 AWG (based on 300 Amp cranking amperage)
Full service-parts list: Cummins/Onan HDKC →, Cummins/Onan HDKCA →, Cummins/Onan HDKCB →
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.