INSTALLATION MANUAL
Page 56 of 77 90-864198020
BATTERY CABLES
1. 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
)
MULTIPLE EFI ENGINE BATTERY INFORMATION
Batteries: Boats with multi-engine EFI power packages require each engine be connected
to its own battery. This ensures that the engine’s Electronic Control Module (ECM) has a
stable voltage source.
Battery Switches: Battery switches should always be positioned so each engine is running
off its own battery. DO NOT operate engines with switches in BOTH or ALL position. In an
emergency, another engine’s battery can be used to start an engine with a dead battery.
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.
1. The boat may have two engines connected to a single Model 32023A battery isolator.
2. The Model 32023A battery isolator is connected to two banks of batteries.
3. Each bank contains two 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; two battery banks,
two 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.
Any other manufacturer’s battery isolator that is the same type as the Sure Power Inc.,
Model 32023A could also be used.
Generators: The generator’s battery should be considered another engine’s battery.
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