Mercury 8.1S Horizon, Product Applications Manual

Page: 124 / 163

Electrical System
90-863758060 AUGUST 2006 Page 8A-5
IMPORTANT: Do not use a battery with wing nut connectors.
• The battery has tapered post or side terminal connectors.
• The battery capacity rating meets or exceeds the recomended Cranking Battery
Specifications :
Cranking Battery Specifications
Model Minimum required rating
5.7L (350 cid) carbureted models 375 cca / 475 mca / 90 Ah
5.7L (350 cid) / 6.2 L (377 cid) MPI models 750 cca / 950 mca / 180 Ah
8.1S (496 cid) - all 750 cca / 950 mca / 180 Ah
All DTS Models 800 cca / 1000 mca / 190 Ah
• The battery has a reserve capacity rating that meets or exceeds the electrical accessory
loads of the particular application. Refer to applicable standards for calculation
procedure.
• The battery is located as close to engine as possible and in an accessible location for
service.
• The battery compartment is properly vented in accordance with the industry standards
and regulations.
• The battery is properly secured in accordance with the industry standards and
regulations. Some standards and regulations require that the battery is installed in an
enclosed case.
• The battery is not installed above or below a fuel tank, fuel filter, or fitting in a fuel line.
(ABYC Standard)
• The battery is installed so that the metallic objects cannot come in contact with the
ungrounded (positive) battery terminal. (ABYC Standard)
• The fuel system components within 305 mm (12 in.) and above the horizontal plane
of the battery top surface is shielded with dielectric material. (ABYC Standard)
• The battery parts that are continuously energized, such as the positive battery terminal
and the cable connections are physically protected with boots or other forms of
protection to prevent accidental short circuits (ABYC Standard).
• The battery installation for multiple engine installations require special battery
considerations.
Battery Cables
NOTE: The battery should be located as close to the engine as possible.
1. Select proper size positive (+) and negative (-) battery cables using the chart.
a. Add the positive and negative cable lengths together.
b. Divide by 2 to obtain the average cable length.
2. Battery cables must comply with SAE J1127 or comparable standards.
Battery Cable Length Requirements
Average Cable Length Cable Gauge
Up to 1.1 m (3-1/2 ft.)
25 mm
2
(4)
1.1–1.8 m (3-1/2–6 ft.)
35 mm
2
(2)
1.8–2.3 m (6–7-1/2 ft.)
50 mm
2
(1)
2.3–2.9 m (7-1/2–9-1/2 ft.)
50 mm
2
(0)
2.9–3.7 m (9-1/2–12 ft.)
70 mm
2
(00)