1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 36Get this manual
Warning Horn A warning horn is built into the OMC prewired remote control or is part of the OMC accessory wiring harnessThis feature alerts the operator to critical operating condition:
Overheatcontinuous tone Test
fN=J To avoid possible powerhead damage, be sure the warning