2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Repair Manual P/N 5005638, Page 90Get this manual
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ELECTRICAL CIRCUIT TEST
00 the following tests if the tachometer does not operateSTEP Set peak-reading voltmeter to "POS" and "50 Check voltage at the battery Use this reading as the reference f