Electrical System; General - Volvo Penta D12-AUX Operator's Manual

Maintenance: Electrical system

Electrical system

General

The engines have a comprehensive electrical engine management system. This automatic system monitors
engine speed as well as the electrical and fuel systems and the engine cooling and lubrication functions. The
system consists of a number of switches and sensors which activate an alarm or automatic stop (optional) if a
fault is detected in the engine.
Supply voltage is 24V.
WARNING! Before starting work on the electrical system, the engine must be stopped and the power tur-
ned off with the main switches. Shore power to the engine heater, battery charger or other extra equipment
fitted on the engine must be disconnected.
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Check the electrical wiring
Make sure electrical connections are tightened, dry
and free from oxide. If necessary, spray these con-
nections with water-repellant (Volvo Penta all-round
oil).
Main switches
The main switches must never be turned off until the
engine has been stopped. Breaking the circuit bet-
ween the generator and the batteries while the engine
is running can damage the generator. For the same
reason, the charge circuits must never be switched
while the engine is running.
IMPORTANT! Never turn the power off using
the main switches while the engine is running.
Fuses
The main electric terminal box has a fuse strip with
two glass-tube fuses (2 x 16A).
NOTE! Determine the cause of the overload before
replacing the fuses.
Electric welding
Disconnect the positive and negative battery cables.
Then disconnect all the leads to the generator.
Always connect the weld clamp to the component be-
ing welded and as close to the welding point as pos-
sible. Never connect the clamp to the engine or gene-
rator in such a way that current can pass across a
bearing.
IMPORTANT! When welding has ceased,
connect the leads to the generator before
reconnecting the battery cables.