Installation manual
DC
ELECTRICAL
SYSTEM
ALTERNATOR
The charging system consists
of
a
DC
belt driven alternator
with a voltage regulator, an engine
DC
wiring harness, a
mounted DC circuit breaker and a battery with connecting
cables. Because
of
the use of integrated circuits (lC's), the
electronic voltage regulator
is
very compact and
is
mounted
internally or
on
the back
of
the alternator.
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#10
REO
ENGINE
SEE
WIRING
DIAGRAM
FOR
WIRE
CONNECTIONS
1. Start the engine.
2. After the engine has run for a few minutes, measure the
starting battery voltage at the battery terminals using a
multimeter set on
DC
volts.
a.
If
the voltage is increasing toward 14 volts, the alterna-
tor is working; omit Steps 3 through 8 and go directly
to
"Checking the Service Battery" on the next page.
h.If
the voltage remains around
12
volts, a problem
exists with either the alternator or the charging circuit;
continue with Steps 3 through
8.
CIDJ
MULTIMETER
o
COM
GROUND
,':1
TO
OPTIONAL
ALTERNATORS.
ALTERNATOR
TROUBLESHOOTING
A
WARNING:
A
failed
alternator
can
become
very
hot.
00
not
touch
until
the
alternator
has
cooled
down.
Use this troubleshooting section to determine if a problem
exists with the charging circuit
or
with the alternator.
If
it
is
determined that the alternator or voltage regulator
is
faulty,
have a qualified technician check it.
The alternator charging circuit charges the starting battery
and the service battery. An isolator with a diode, a solenoid
or a battery selector switch
is
usually mounted
in
the circuit
to
isolate the batteries so the starting battery
is
not discharged
along with the service battery.
If
the alternator
is
charging the
starting battery but not the service battery, the problem
is
in
the service battery's charging circuit and not with the alterna-
tor.
Testing
the
Alternator
A
CAUTION:
Before
starting
the
engine
make
certain
that
everyone
is
clear
of
moving
parts!
Keep
away
from
sheaves
and
belts
during
test
procedures.
A
WARNING:
When
testing
with
a
multimeter:
DC
and
AC
circuits
are
often
mixed
together
in
marine
applications.
Always
disconnect
a
shore
power
cord,
iso/ate
DC
and
AC
converters,
and
shut
down
the
engine
before
performing
DC
testing.
No
AC
.tests
should
be
made
without
a
proper
know/edge
of
AC
circuits.
TESTING
THE
STARTING
BATTERY
IALTERNATOR
(ENGINE
RUNNING)
-=
GROUND
3. Turn off the engine. Inspect all wiring and connections.
Ensure that the battery terminals and the engine ground
connections are tight and clean.
A
CAUTION:
To
avoid
damage
to
the
battery
charging
circuit,
never
shut
off
the
engine
battery
switch
when
the
engine
is
running!
4.
If
a battery selector switch is in the charging circuit,
ensure that it is on the correct setting.
S.
Turn
on
the ignition switch, but do not start the engine.
6. Check the battery voltage.
If
the battery
is
in good condi-
tion, the reading should be
12 to
13
volts.
TESTING
THE
ALTERNATOR
VOLTAGE
(IGNITION
ON
-
ENGINE
OFF)
Cl2ID
~W---MULTIMETER
Engines & Generators
-=
GROUND
24