2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 99Get this manual
ELECTRICAL ELECTRIC STARTER TESTS
No Load Current Draw Test
IMPORTANT: Put the starter in vise or suitable
fixture and make sure it is tight before proceeding with this checkUse battery rated at 350 CCA or higher that is in good condition and fully chargedConnect to 50 amp ammeter in series with heavy jumper between the battery positive (+) terminal and the starter positive (+) terminalFluke model 334 or 336, Snap-On model MT110 or EETA501, and various other ammeters should be available through your local tool suppliers
Monitor the starter RPM and current draw and refer to the chart below for the correct specifications