Precaution On Electric Wiring; Alternator - Yanmar 3TNV Series Service Manual

11. Electric Wiring

11.2 PRECAUTION ON ELECTRIC WIRING

11.2.1 Alternator

In the cases listed below the warranty shall not be deemed to apply. Please be sure to read these
conditions carefully when planning to use it with other equipment. Also be certain to give appropriate
guidance on usage to the user.
(1) When the battery cable can be connected backwards
The alternator diode will be damaged and recharging made impossible if the plus and minus ends of the
battery cable are confused. The stator coil will also be burned as a result. To prevent this, supply the
user with a cable of such a length or structure that the plus and minus ends cannot be confused. Also
warn the user not to connect the cable backwards.
(2) When charging output voltage is used for control purposes
The engine speed at starting is not proportional to the output voltage of the alternator, so this output
voltage must not be used for any control systems. It is especially wrong to use it for the control signal
of the safety relay for cutting the starter motor because this will damage the starter motor and cause
engine starting failure.
(3) When the L line is used for control purposes
Consult with Yanmar first before connecting any load other than the charge lamp to the L line.
Damage to the alternator and related equipment will not be warranted without such prior consultation.
(4) Non-use of the Yanmar wiring diagram
Use without prior consultation of any wiring diagram other than that provided by Yanmar removes any
breakdown of any electrical equipment from the warranty.
(5) Regarding lamp control
Once the charge lamp goes out after the start of charging, it does not come on again even if the engine
speed falls and charging is insufficient. The lamp will not light again if the charging circuit is normal.
The lamp only comes on during operation if the alternator itself is broken or the drive V-belt breaks.
However, when an LED is used for the charge lamp, the LED will shine faintly even during normal
operation. This is due to the control system for the alternator lamp and is not an abnormality.
(6) Use of a non-specified V-belt
Use of a non-specified V-belt will cause inadequate charging and shorten the life of the belt. Use a
belt of the specified type.
(7) Direct high pressure washing is prohibited
Water will enter the brush if the alternator is washed directly at high pressure, causing inadequate
charging. Warn users not to use direct, high-pressure washing.
(8) Use of agricultural or other chemicals (direct contact or airborne)
Adhesion of agricultural and other chemicals, especially those with high sulfur content, to the IC
regulator corrodes the conductor on the substrate, leading to over-charging (battery boiling) and
charging malfunctions. Consult with Yanmar prior to use in such an environment. Use without prior
consultation removes any breakdown from the warranty.
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