1990 Johnson Evinrude "ES" 40 thru 55 Service Repair Manual, P/N 507872, Page 247Get this manual

1990 Johnson Evinrude "ES" 40 thru 55 Service Repair Manual, P/N 507872, Page 247

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Clean and retighten, or replace, any connectioncable, or component having greater than specified voltage drop1 Connect voltmeter positive lead to battery positiv