CHARGING & STARTING SYSTEM
Page 2B-4 90-884294 OCTOBER 2001
Battery Cable Size
If standard (original) battery cables are replaced with longer cables, the wire gauge size must increase. See
chart below for correct wire gauge size.
Battery Cable Length
Wire Gage Size
Battery Cable Wire Gage Size
Mercury/Mariner Outboards
Battery Cable Length
8 ft.
2.4m
9 ft.
2.7m
10ft.
3.0m
11ft.
3.4m
12ft.
3.7m
13ft.
4.0m
14ft.
4.3m
15ft.
4.6m
16ft.
4.9m
17ft.
5.2m
18ft.
5.5m
19ft.
5.8m
20ft.
6.1m
21ft.
6.4m
22ft.
6.7m
23ft.
7.0m
24ft.
7.3m
Models Wire Gage Size No. SAE
6-25 Hp
#8* #8 #6 #6 #6 #6 #4 #4 #4 #4 #4 #4 #4 #4 #2 #2 #2
30-115
Hp
#6* #4 #4 #4 #4 #4 #2 #2 #2 #2 #2 #2 #2 #2 #0 #0 #0
125-250
Hp (ex-
cept
DFI)
#6* #6 #4 #4 #4 #4 #4 #4 #2 #2 #2 #2 #2 #2 #2
DFI
Models
#4* #2 #2 #2 #2 #2 #2 #2 #2 #2 #0 #0 #0
* = Standard (original) Cable Length and wire gage size.
Replacement Parts
WARNING
Electrical, ignition and fuel system components on your Mercury Outboard are
designed and manufactured to comply with U. S. Coast Guard Rules and Regula-
tions to minimize risks of fire and explosions. Use of replacement electrical, igni-
tion or fuel system components, which do not comply with these rules and regu-
lations, could result in a fire or explosion hazard and should be avoided.
Recommended Battery
A 12 volt marine starting battery with a minimum Cold Cranking amperage rating of 490
amperes or 630 (minimum) Marine Cranking amperes should be used.
CAUTION
Deep-cycle batteries are not suitable for use as engine starting batteries or for
use as accessory batteries that are connected to high output engine charging
systems. Deep-cycle battery life may be shortened by high output engine charg-
ing systems. Refer to individual battery maker instructions for specific battery
charging procedures and applications.
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