Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 367Get this manual
Horn Does Not Sound Self-Test Beep When Key Switch Is Turned To "On"
TEST 1: Short tan (ortanblu) wire from test pOint to good outboard groundKey switch must be in "ON" positionI
Horn soundsGo to TEST 2
Horn does not soundProblem is not AutoBlend related Go to Section and troubleshoot outboard or remote control electrical system
TEST 2: With key switch in "ON" position, check for battery voltage (9V DC minimum) pin #1 of 3-pin connector
TEST 6: Check for battery voltage (9V DC minimum) at test pOint 2
I Go to TEST 6
Power not present
Power presentGo to TEST 3
Power not present
Power presentProblem is not AutoBlend related Go to Section and troubleshoot outboard or remote control electrical systemRepair, clean or replace purple wire andor connec- tor between pin #1 of 3-pin connector and Test Point2