Evinrude 4906B 4HP 1969 Owner's Manual page 201

6-12 ELECTRICAL
switch to carry the heavy current from the
battery to the starter
is actuated by turning the ignition key to
the START position.
pushbutton is used to actuate
See Section 6-11 for detailed service pro-
cedures on the starter motor circuit.
6-9 CHARGING CIRCUIT SERVICE
The generator has two terminals
lower end. One terminal is larger than the
other and the wires connected
ent size connectors
wire is connected to the correct terminal.
If several electrical
and the engine is operating at idle speed, or
below rpm for extended
1500
time, the battery will not recieve adequate
current to remain in serviceable condition.
The rated capacity
10-amps. Therefore,
sory load should not exceed
current will be drawn from the battery at a
greater rate than the generator
produce. Such a negative
battery ill result in a run-down condition
w
and failure of the battery
required current to the starter for cranking
the engine.
To calculate the amperage
accessory the following simple formula may
be used: Amps equals watts
=
volts. Amps Watts
Volts
Front view of a Jolmson outboard with the generator
on
mounted the port side.
motor. The solenoid
On some models, a
the solenoid.
on the
have differ-
to ensure the proper
accessories are used
per iods of
of the generator
the electrical acces-
lO-amps or
is able to
draw on the
to provide the
draw of an
divided by
The volts will always be 12. Accessories
will usually be given in watts.
lete measurement
then one candle power is equal to approxi-
mately one watt.
running lights requiring
lights use 10 watts; and a radio rated at 30-
watts.
Amps
In this case, if all the lights are on and
the radio is being used, the total draw on
the battery would be 4 amps.
is running at 1500 rpm or higher, and the
generator circuit is performing properly
charging the battery
net post ive gain of 6 amps is being recieved
the battery.
by
The battery can be externally charged or
the engine can be equipped with a generator
to charge the battery
operating.
is
A voltage regulator,
tion box on the rear of the engine, is con-
nected between the generator
tery to prevent overcharging of the battery
while the engine is operating.
box also houses a fuse to protect the charg-
ing circuit.
The generator
1500 rpm engine speed to effectively
the battery.
meter on the dash
charge to the battery.
If the boat has a twin engine installation,
the usual practice is to use only one battery
for cranking both units.
installation,
should be used to charge and maintain the
battery at its full ampereage rating.
Most mechanics have discovered if both
generators of a twin installation
nected to charge the battery,
"fight" the other.
improved system,
causes many
that are unexplainable.
detailed service procedures on the generator
circuit.
TROUBLESHOOTING
One of three areas causing problems in
the generating
system to
maintain the
charge. Remember, the generator will only
produce approximately
If the obso-
of candle power is used,
Example: A boat has
8-watts;
=
48 Watts/12 volts
If the engine
with 10 amps, then a
while the engine is
mounted in a junc-
and the bat-
The junction
circuit requires
At this speed, the ampere
w ill indicate
With such a twin
only one engine
one seems to
Instead of having an
this type of
serious electrical
See Section 6-9 for
circuit and failure
provide sufficient
battery as a.
10 amps of current.
auxiliary
=
4 Amps.
by
at least
charge
a positive
generator
are con-
hook-up
problems
of the
current to -
satisfactory