Volvo Penta D2-55, Workshop Manual

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Group 30 Electrical system
1. Coolant temperature sensor (extra equipment)
2. Coolant temperature monitor
3. Fuses
4. Starter relay
5. Glowplug relay
6. Charge sensing resistor
7. Engine speed sensor
8. Starter motor
9. Alternator
10. Glowplug , 4 pcs.
11. Oil pressure sensor (extra equipment)
12. Oil pressure monitor
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General
The engine is fitted with an AC alternator. The system
voltage is 12V and the electrical system is single-pole.
The electrical system can include, as extra equip-
ment, sensors for monitoring the engine’s coolant
temperature and oil pressure.
The electrical system is shown in two ways. The wir-
ing diagram shows wire runs, cable cross section and
color.
Fuses
The engine is equipped with a fuse block with four fus-
es (15A). One fuse safeguards the electrical system
and blows if overloaded, the others are spares.
If a fuse blows, the electrical system can be recon-
nected by moving the cable to the next fuse/connec-
tor. Always first investigate the reason for the over-
load.
Relays
The starting and glowplug functions are each con-
trolled by a switching relay. These relays are identical
and are thus mutually interchangeable.