1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Repair Manual, P/N 507870, Page 98Get this manual
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Troubleshooting Test Equipment
Stevens NoS21, S13C, or S48 Mercotronic No55-4S or 55-6S
Peak-reading voltmeters Mercotronic No781 Stevens NoCO-77 Electro-Specialties NoPRV-1