Cummins/Onan 5.5 NH / 6.5 NH — Battery Connections (Mobile Models)
Installation
For the Cummins/Onan 5.5 NH / 6.5 NH, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan NH engine
Before you start
- Accidental starting of the set might cause severe personal injury or death. Connect the batteries last to avoid accidental starting of the set during installation.
- Never disconnect the battery with either engine running and never crank both engines simultaneously.
- Ignition of explosive battery gases might cause severe personal injury. Do not smoke while servicing batteries.
Procedure
- Mount the battery in a rigid mounting support in a separate compartment from the set or any spark producing device.
- Provide a minimum of 2 square inches at top and 2 square inches at bottom of battery for ventilation.
- Seal battery cable entry points vapor tight if they enter or pass through living area.
- Connect the positive (+) battery cable to the terminal marked BAT on the start solenoid.
- Connect the negative (-) cable to the generator through-bolt; connect battery positive before battery negative.
- Ensure voltage drop from battery terminals to exciter cranking windings does not exceed 0.12 volts per 100 amperes of break-away current while cranking.
Tools required
- Voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum 12 volt battery above 32°F (0°C): 360 cold cranking amps (approximately 70 amp/hr)
- Below 32°F (0°C): 500 cold cranking amps (approximately 95 amp/hr)
- Recommended battery cables 0-10 ft: size 2; 11-15 KuduParts $20.00 FridayParts $20.30 ft: size 0; 16-20 Amazon eBay FridayParts $14.38 ft: size 000
Source: Cummins/Onan operator's 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.