Safety Precautions; Battery Components And Functions; Battery Capacity And Battery Cables - Yanmar 6LY3 series Service Manual

Safety Precautions

12/05
SAFETY PRECAUTIONS
Before servicing the electrical components, read
the following safety information and review the
Safety Section on page 2-1.
BATTERY COMPONENTS AND
FUNCTIONS
See Checking the Electrolyte Level on page 12-4
for electrolyte level and battery charge.
The battery utilizes chemical action to convert
chemical energy to electrical energy. This engine
uses a lead acid battery which stores a fixed
amount of power that can be used when required.
After use, the battery can be recharged and used
again.
As shown in Figure 12-1, a nonconductive
container is filled with dilute sulfuric acid electrolyte.
Lead dioxide positive (+) plates (Figure 12-1, (7))
and lead dioxide negative (-) plates
(Figure 12-1, (4)) separated by glass mats
(Figure 12-1, (6)) are stacked alternately in the
electrolyte. The positive (+) and negative (-) plates
are connected to their respective terminals
(Figure 12-1, (1)).
Figure 12-1
(1)
(8)
Figure 12-1
1 – Terminal
2 – Filler Cap
3 – Cover
4 – Negative Plate
5 – Separator Plate
6 – Glass Mat
7 – Positive Plate
8 – Battery Case
6LY3 Service Manual
Power is removed from the battery by connecting a
load across these two terminals (Figure 12-1, (1)).
When the battery is discharging, an electric current
flows from the positive (+) plates to the negative (-)
plates. When the battery is being charged, electric
current is passed through the battery in the
opposite direction by an external power source.

Battery Capacity and Battery Cables

Standard
Cold Weather
Full Charged Specific Gravity
Battery Cables
Battery cables should be selected with the correct
flow and length in mind. As a rule, thick cables are
kept to the minimum required length and should be
used to connect the battery to the starter.
Using wire other than those specified may cause
the following troubles:
Figure 12-2
(2)
(3)
(4)
(5)
(6)
(7)
0006261
© 2007 Yanmar Marine International
ELECTRICAL AND ECU
Battery Capacity
Wire thinner than specified
Wire longer than specified
High wiring resistance
Low current
Faulty starting
Figure 12-2
12V-150Ah
12V-150Ah
1.26
Single conductor wire
Open circuit caused
by vibrations
Faulty charging
0006350
12-3