Supra SR Owner's Manual page 82

Dual Battery (Option) Hookup
To properly hook up the two batteries;
1. Connect the grounding strap provided from the negative
(-) post on Battery 1 to the negative (-) post on Battery 2.
2. Connect the negative (-) cable from the grounding buss
bar to the negative (-) post on Battery 1.
3. Connect the negative (-) cable from the engine to the
negative (-) post on Battery 1.
4. Connect the positive cable from the left side of the
battery switch to the positive (+) post on Battery 1.
5. Connect the positive cable from the bottom of the switch
to the positive (+) post Battery 2.
Battery 1 is designated as the primary battery and Battery
2 is designated as the secondary battery.
Skier's Choice installs a 4-position battery switch on any
boat equipped with dual batteries. It is recommended
that both batteries be fully charged between each use to
insure they can deliver the electrical demands required
for each outing. The purpose of our recommendation is
to utilize one primary battery for all operational needs,
and have the other as a backup if the primary battery
discharges.
This situation could occur if you run your accessories
such as ballast or stereo for a long time, without running
the boat. The dual battery setup is designed to create
a redundant system allowing the user to have a backup
battery. The switch must be in the "1" or "2" position to
create the redundancy.
The 4 positions available on the battery switch are: Off
/ 1 / 2 / 1&2. These choices indicate which battery is
being used to power the boat and which battery is being
charged by the engine's alternator.
We recommend using only position 1 or 2 while boating.
Battery switch position "1&2" is available but not recommended as power will be drawn from both batteries and the
alternator will have difficulties keeping both batteries charged simultaneously. It also creates a ground differentiation which
in turn will create issues with sensitive electrical components such as the Vision screen. The only time you may need Position
1 & 2 would be in an emergency situation where both batteries are low and need power from both to help start the engine.
Do not turn the selector switch to the "Off" position when the motor is running. The alternator will be permanently damaged and
is not covered under Skier's Choice or Indmar warranty.
It is highly recommended that Position "1" be used in most situations so the secondary battery will be available to start the engine
from Battery 2 (secondary) if necessary.
Be aware that if position "1&2" is selected, both batteries will drain power at the same time and could leave you stranded due to
weak batteries.
NOTE: It is recommended that you fully recharge your batteries using a battery charger periodically or after a period of high
discharge (running many accessories for an extended period of time).
NOTE: Skier's Choice highly recommends using quality "Dual Purpose" batteries.
© 2016 Skier's Choice, Inc.
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