1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 30Get this manual
Switch Box Installation IInSlall switch bo; to engine wi th screws8 shown in Figure 13Make sure that switch bo; is grou nded to engi ne thfU moun ting scre ws, and ground lead2Recon nect wires to proper termi nals of switch box Secu re ground lead to switch box using screw(Figure 13) Wires wi th yello identification sleeve mu st he con nected 10 lower switch boxLower switch box fi res cy linders No.2, and 6
8' Ground Wire [between (-) Coil Terminal and Mounting Screwl Ignition Coils (+) Coil Terminal Coil Cover
ACAUTION
Switch boxes must be grounded to engine before cranking engine, or switch boxes will be damaged
Figure 12Ignition Coli
IGNITION COIL REMOVAL and INSTALLATION Ignition Coli Removal
IRemove reat co wl support bracket from engine2Hemm'e the spark plug (h igh tension) lead from the defect ive coil3Di sconnect wires from (+) and (-) termina ls on defective ignition coil4Bemo ve screws and lift coil cover al ong wit coil from engi neRemove defective coil from cover