Cummins/Onan — Starter Performance Testing
Testing & diagnosis · Electric starter
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Use conductor of at least #14 AWG diameter and as short as possible.
- Wire the unit with battery providing at least 11.8 volts after switch is closed.
- Rpm should be not less than 8000 and current draw not greater than 25 amperes.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 11.8 volts
- 8000 rpm minimum
- 25 amperes maximum
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.