Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 55Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 55

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OUTBOARD MOTOR INSTALLATION
Connect common ground cable (wire size same as engine battery cables) between NEGATIVE () terminals on starting batteries

dCommon Ground Cable