Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 70Get this manual
CHARGING SYSTEM
6Make all wiring connections, as shown in wiring diagram "A"
WIRING DIAGRAM "A" Rectifier Kit InstallationAlternator Kit (16837A2)RectifierFuse Holder with 10 Amp FuseExtension Harness22 in(56 cm) LongBattery Harness69 in(175 cm) LongBattery
Battery Connections