Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 161Get this manual
Push rubber grommet (a) of extensio harness, into opening in botto cowl Battery Connections
Failure to observe correcl polarity when connecti ng battery harness leads to batterywill result In damage 10 the charging system
Ho use battery in battery box and secu re in favorable position in boatCon nect red battery harness lead to positive (+) battery terminal and black battery ha rness lead to negative (-) battery termina l
Special Operating Instructions
Disconnect both (2) yellow red altemalor leads (refer to Wiring DiagramA") before operating outboard motor without battery harness leads connected to battery