Volvo Penta D1-13 Workshop Manual page 12

30-0 General
General alternator information
Alternator voltage must be limited to prevent battery
electrolyte from evaporating. Alternator output is con-
trolled (limited) by the voltage regulator in the alter-
nator. The maximum current that the alternator can
deliver with a controlled output depends on alternator
rpm. In order for the alternator to charge efficiently a
sensor line may be connected between the alternator
and the battery plus terminal. A voltage drop in the
cable between the alternator and the battery plus ter-
minal is compensated in this way. When the engine is
started a magnetization current is required to excite
the alternator.
NOTICE! It is power consumers (including the batter-
ies) that determine output current from the alternator.
Measurements:
1 Engine switched OFF.
2 Use 88890074 Multimeter to perform a voltage
test across the batteries. The nominal voltage
across a fully-charged battery is around 12.7 V
(depending on ambient temperature).
3 Start the engine. Run at 1,500 rpm.
4 Use 88890074 Multimeter to perform a voltage
test across the batteries. The nominal charge
voltage across the battery should be around
13.8-14.6 V.
10
Check the charging system
Tools:
88890074 Multimeter
Charging system fault tracing
Battery (orange indication):
1 Check that all battery connections are properly
installed.
2 Check the cables to the battery.
3 Check the battery electrolyte level.
4 If possible, check the specific gravity in all cells.
No charge:
1 Check the tension of the alternator drive belts.
2 Check that the alternator and battery connectors
are correctly installed.
3 Check the condition of all charging system
cables.
4 Check that the alternator is receiving the correct
magnetization voltage.
5 Regulator fault; check with another alternator.
Charge too low:
1 Check the tension of the alternator drive belts.
2 Check that the alternator and battery connectors
are correctly installed.
3 Check the condition of all charging system
cables.
4 Regulator fault; check with another alternator.
Over charge:
1 Possible regulator fault; check with another
alternator.
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