Installation manual
DC
ELECTRICAL
SYSTEM
DESCRIPTION
The
charging system consists
of
an alternator with a mounted
voltage regulator, an engine
DC
wiring harness, a mounted
DC
circuit breaker, and a battery and connection wires.
Because
of
the use
of
integrated circuits (IC's) the electronic
voltage regulator is very compact and is mounted internally
or
on the back
of
the alternator.
Alternator
Troubleshooting
If
you suspect that the alternator is not producing enough
voltage to charge the engine's battery, check the following:
A
WARNING:
A
failed
alternator
can
become
very
hot.
00
not
touch
until
the
alternator
has
cooled
down.
o Make certain your alternator is securely mounted.
o Check the drive belts for proper tension.
A.
WARNING:
Before
starting
the
engine
make
certain
that
everyone
is
clear
of
moving
parts!
Keep
away
from
sheaves
and
belts
during
test
procedures.
5. Start the engine.
6. The voltage reading for a properly operating alternator
should be between 13.5 and 14.5 volts.
If
your alternator
is over-
or
undercharging, have it repaired at a reliable
service shop.
NOTE:
Before removing the alternator for repair, use your
voltmeter to ensure that
i 2 volts
DC
excitation is present
at
the R terminal
if
the previous test showed only battery volt-
age at the B output terminal.
.14
GRAY=====O=~_-r-_
o Inspect for loose
or
disconnected wires at the alternator.
~~e;~~~~~F~
~~i#====#14BRDWN
NOTE:
An
isolator with a diode, a solenoid,
or
a battery '14
PINKJBlUE
-tHH4I?~
selector switch is usually mounted in the circuit to isolate the
batteries
so
the starting battery is
not
discharged along with
the house batteries.
If
the isolator is charging the starting
battery but
not
the house battery, the alternator
is
OK
and
the problem is
in the battery charging circuit.
A
WARNING:
Shut
off
the
engine
battery
switch
or
disconnect
from
the
battery
when
working
on
the
engine
electrical
system.
Checking
for
Proper
Voltage
'14
BRD\"'N=====i~@
TYPICAL
51
AMP
ALTERNATOR
CONNECTIONS
~~~~=f10RED
If
you suspect the alternator has failed perform the following
tests with the engine off:
.14
RED==f==~~iS-+
......
1. Using a voltmeter, connect the voltmeter red wire clip to
the output terminal B+.
2. Connect the voltmeter negative wire to any ground on the
engine .
. 3. Check the battery voltage. It should read
12
to 12 volts.
4. Check the voltage between the alternator
(+) positive ter-
minal B and any engine ground.
If
the circuit is good, the
voltage at the alternator should
be
the same as the battery
(unless there's an isolator in the circuit, then the reading
would
be
zero).
A
CAUTION:
To
avoid
damage
to
the
battery
charging
circuit,
never
shut
off
the
engine
battery
switch
when
the
engine
is
running!
rvvl
WESIERBEKE
I Engines & Generators
18
.l;;.2\,I:;'
~~::=C:CC3l!ยง
.14
PINKJBlUE
rr!?J~~=:::.
.14
BROWN
OPTIONAL
72
AMP
,
ALTERNATOR
CONNECTIONS