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SERVICE BULLETIN
DATE:
September 18, 1975
BULLETIN NUMBER: 87
MODEL:
All Mar ine Engines
SUBJECT: Alternator Output Spli tter
GENERAL
DESCRIPTION:
The
spli tter
is
a
solid
state
device
which
allows two batteries to be recharged and brought to the same ultimate
voltage from a single alternator as large as 120 amp and, at the same
time,
isolates
each
battery
so
that
discharg ing
one
will
have
no
effect on the other.
Charging rates are in proportion to the bat-
teries'
voltage
(state
of
discharge).
This
method
precludes
the
necessity, and even the desirability, of a rotary switch for selecting
which battery is to be charged.
It also assures that ships services
cannot drain the engine starting battery.
INSTALLATION:
1.
Mount
splitter
on a metal
surface other
than
the
engine,
pre-
ferably in an air stream if available.
Do not install near engine
exhaust system.
Install with cooling fins aligned vertically.
2.
Be sure to use a wire size appropriate to the output of the asso-
ciated alternator.
In full power systems number 4 wire is recom-
mended from the alternator to the spli tter and from the spli t ter
to the batteries.
3.
Connect the alternator output terminal to the center splitter ter-
minal.
4.
Connect one splitter side terminal to one battery (s).
5.
Connect the other splitter side terminal to the other battery (s).
6.
When the splitter is installed, both batteries will see a charging
voltage 8/10 volts less than usual.
This voltage can be regained,
if
desired,
by
connecting
the
regulator
wire
directly
to
the
alternator output terminal instead of the regulator terminal.
TEST INFORMATION:
When the engine is not running, the side splitter
terminals
should
read
the vol tage of
the
respective battery.
The
center splitter should read zero voltage.
With
the engine
running and alternator
charging,
the side splitter
terminals should read the same voltage which should be the voltage of
the regulator or somewhat less.
The center splitter terminal should
read .82 volts higher than the readings of the side terminals.
PIN:
Continued •••••••••••
J. H. WESTERBEKE CORP.
AVON INDUSTRIAL PARK, AVON, MASS. 02322· (617) 588-7700
CA8LE: WESTCORP, AVON· TELEX: 112-4444
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