1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 133Get this manual
Temperature Switch Test Purpose One heat sensitive switch is installed in the cylinder head to monitor engine temperature The switch is connected in series with the control box warning hornIf the switch senses temperature in excess of predetermined limit, contacts close and cause the warning horn to sound continuous tone when the key switch is in the ON position INotel To ensure that th.e temperature .ca.n alert the operator dunng an overheating condition, It IS very important that the control box warning horn be tested on regular basisSee Warning Horn Test, Section 1Testing
L!:.I ture switch from the cylinder head
f41 1Disconnect the bullet connector(s) and remove the tempera2Using continuity light or ohmmeter, make positive connections to the switchone lead to the switch lead and one lead to the metal portion of the