Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 161Get this manual
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Push rubber grommet (a) of extensio harness, into opening in botto cowl Battery Connections
Alternator Kil (16837A2) Rectifier Fuse Holder wi th 10 Amp Fuse Extension Harness22 In (56cm)