Charging and Starting System
90-8M0050731 MAY 2011 Page 2B-9
NOTE: If longer battery cables are required, the wire gauge size must increase. See the following chart for correct wire gauge
size.
a - Wire gauge size
b - Battery cable length
Cable Length
Copper Battery Cable Wire Gauge Size Number
(SAE)
Cable Length
Copper Battery Cable Wire Gauge Size Number
(SAE)
Verado and OptiMax DTS Engines Verado and OptiMax DTS Engines
2.4 m (8 ft)
‑
7.6 m (25 ft)
1
2.7 m (9 ft)
‑
7.9 m (26 ft)
1/0
3.0 m (10 ft)
‑
8.2 m (27 ft)
1/0
3.4 m (11 ft)
‑
8.5 m (28 ft)
1/0
3.7 m (12 ft)
4
8.8 m (29 ft)
1/0
4.0 m (13 ft)
2
9.1 m (30 ft)
1/0
4.3 m (14 ft)
2
9.4 m (31 ft)
1/0
4.6 m (15 ft)
2
9.8 m (32 ft)
1/0
4.9 m (16 ft)
2
10.1 m (33 ft)
2/0
5.2 m (17 ft)
2
10.4 m (34 ft)
2/0
5.5 m (18 ft)
2
10.7 m (35 ft)
2/0
5.8 m (19 ft)
2
11.0 m (36 ft)
2/0
6.1 m (20 ft)
2
11.3 m (37 ft)
2/0
6.4 m (21 ft)
1
11.6 m (38 ft)
2/0
6.7 m (22 ft)
1
11.9 m (39 ft)
2/0
7.0 m (23 ft)
1
12.2 m (40 ft)
2/0
7.3 m (24 ft)
1
Replacement Parts
!
WARNING
Avoid fire or explosion hazard. Electrical, ignition, and fuel system components on Mercury Marine products comply with federal
and international standards to minimize risk of fire or explosion. Do not use replacement electrical or fuel system components
that do not comply with these standards. When servicing the electrical and fuel systems, properly install and tighten all
components.
IMPORTANT: 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 charging
systems. Refer to individual battery manufacturer instructions for specific battery charging procedures and applications.
Recommended Battery
USA and Canada (SAE) specifications: A 12 volt marine starting battery with a minimum marine cranking amperage (MCA) rating
of 800 amperes with a minimum reserve capacity rating of 135RC should be used.
International (EN) specifications: A 12 volt marine starting battery with a minimum cold cranking amperage (CCA) rating of 975
amperes with a minimum of 65 ampere hour (Ah) rating should be used.
IMPORTANT: For DTS products, each engine must be equipped with its own starting battery. If your boat application requires
additional battery loads for boat accessories or marine electronics, it is recommended that an auxiliary battery or batteries be
installed.
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