1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 124Get this manual
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Models Not Equipped With Test Button (3 and Cylinder) DESCRIPTION
51551 Powerhead Temperature SensorWarning ModuleTerminal BlockWarning HornIgnition SwitchEngine HarnessRemote Control HarnessLow