Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 366Get this manual
Troubleshooting General Checks
Before troubleshooting the AutoBlend system, check the following: 1Look for loose, corroded or dirty connections, pins or terminals2Fully engage all plug-in connectors3Fully charge battery4Make sure outboard has not overheated 5All other outboard and remote control electrical systems must be working