Yanmar 3JH4CE - Battery

12. Electrical System
174
12.2 Battery
Refer to 2.2.3(2) for electrolyte level and battery charge.
Also refer to the service manual of the 3/4 JH3E series for other data regarding battery.
(1) Battery capacity
Since the battery has a minimum capacity of 12V, 80AH. it can be used for 80-120AH.
(2) Battery cable
Wiring must be performed with the specified electric wire. Thick, short wiring should be used to connect
the battery to the starter, (soft automotive low-voltage wire [AV wire]) Using wire other than that specified
may cause the fol. lowing troubles:
The overall length of the wire between the battery (+) terminal and the starter (B) terminal, and between
the battery (-) terminal and the engine earth terminal, should be determined according to the following
table.
Note :Excessive resistance in the key switch circuit (between the battery and start [S] terminals) can
cause improper pinion engagement. To prevent this, follow the wiring diagram carefully.
Battery capacity minimum 12V-80AH
standard 12V-100AH
cold district 12V-120AH
Full charged specific gravity 1.26
Voltage system
Allowable wiring voltage
drop
Cross-section area Allowable length
12V 0.2V or less/100A
15 (mm
2
)
< 0.86 (m)
20 (mm
2
)
< 1.3 (m)
30 (mm
2
)
< 2.3 (m)
40 (mm
2
)
< 2.8 (m)
50 (mm
2
)
< 3.5 (m)
60 (mm
2
)
< 4.1 (m)