GASOLINE ENGINE 8.1 S INBOARD MODELS
Page 19 of 58
Battery Isolators: Isolators can be used to charge an auxiliary battery used for powering
accessories in the boat. They should not be used to charge the battery of another engine
in the boat unless the type of isolator is specifically designed for this purpose.
NOTE: Sure Power Industries Inc. Model 32023A meets this design specification. Any other
manufacturer’s battery isolator that is the same type as the Sure Power, Inc. Model 32023A
could also be used.
1. The boat may have 2 engines connected to a single Model 32023A battery isolator.
2. The Model 32023A battery isolator is connected to 2 banks of batteries.
3. Each bank contains 2 batteries with the cranking battery for 1 engine in each bank.
4. The second battery in each bank is connected in parallel to the cranking battery.
5. The Model 32023A battery isolator is designed for this type of use; 2 battery banks, 2
charging sources, 120 amps (maximum alternator output).
6. When the engines are running, either engine’s alternator could be charging either bank
of batteries through the Model 32023A battery isolator.
Generators: The generator’s battery should be considered another engine’s battery.
BATTERY CABLES
Select proper size positive (+) and negative (–) battery cables, using chart. Battery should
be located as close to engine as possible.
IMPORTANT: Terminals must be soldered to cable ends to ensure good electrical
contact. Use electrical grade (resin flux) solder only. Do not use acid flux solder as
it may cause corrosion and a subsequent failure.
Cable Length
Cable Gauge
Up to 3-1/2 ft (1.1 m) 4 (25 mm
2
)
3-1/2 - 6 ft (1.1-1.8 m) 2 (35 mm
2
)
6 - 7-1/2 ft (1.8-2.3 m) 1 (50 mm
2
)
7-1/2 - 9-1/2 ft (2.3-2.9 m) 0 (50 mm
2
)
9-1/2 - 12 ft (2.9-3.7 m) 00 (70 mm
2
)
12 - 15 ft (3.7-4.6 m) 000 (95 mm
2
)
15 - 19 ft (4.6-5.8 m) 0000 (120 mm
2
)
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