Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 325Get this manual
6Wrap neoprene sheet around cable bundle and secure each end with sta-strap Battery Connections
ACAUTION
Failure to observe correct polarity when connecting battery cable to battery, will result in damage to the charging system1A battery with minimum reserve capacity rating of 100 minutes (minimum cold cranking rating of 350 amperes) is recommended2House battery in battery box and secure in favorable position in boat
aWiring HarnessNeoprene SheetSta-Straps