Electrical System; Important; Arc Welding; Starting With Auxiliary Battery - Volvo Penta TAD1630G Workshop Manual

Group 22
The engines are equipped with a 2-pole electrical system
with an alternator. System voltage is 24 volts.

Important

For engines with alternators the following is applicable:
IMPORTANT! Never break the circuit between alter-
nator and battery when the engine is running. The
main switch must therefore not be switched off until
the engine has stopped.
1
Cables shall not be disconnected while the engine is running
since this can also damage the voltage regulator.
2
Batteries, battery cables and cable terminals shall be
checked regularly. The battery poles shall be well- cleaned
and the cable shoes always tightened and well greased so
that no interruption occurs. All cables shall be well tightened,
and there shall be no loose connections.
Note: Do not interchange the battery's plus and minus poles
when fitting the batteries. Refer to the wiring diagrams.
Check drive belt tension regularly.
3
When starting with auxiliary batteries, see "Starting with
auxiliary battery".
4
When repairing the alternator, both battery cabled shall be
removed first. The same applies for quick-charging of batter-
ies.
Note: Follow applicable safety instructions when charging
batteries.

Arc welding

When arc welding on the engine or on installed components,
always prepare as follows:
Remove the 2 battery cables and then remove all the alter-
nator cables from the alternator.
Attach the welding clamp to the component to be welded and
as close to the welding spot as possible. Never attach the
welding clamp to the engine or in a way that the current will
have to pass through a bearing.
IMPORTANT! After the welding is finished: Install the
alternator cables before installing the battery cables.

Electrical system

Starting with auxiliary battery

If the batteries are frozen they must be thawed out first be-
fore attempting to start them with an auxiliary battery.
1
Check that the auxiliary batteries are connected (in series or
parallel) so that the rated voltage corresponds with the en-
gines system voltage.
2
First connect the red jumper cable (+) to the auxiliary bat-
tery's plus terminal and then to the dead battery.
3
Then connect the black cable (-) to the auxiliary battery. And
lastly to a point some way off from the dead batteries, e.g. at
the main switch, minus cable or connection of minus cable to
the start engine.
6
Start the engine.
Note: Do not interfere with connections when attempting to
start (spark risk) and do not lean over batteries.
7
Remove cables in exactly the reverse order to which the
were connected.
Note: The regular cables to the standard batteries must nev-
er be disconnected.
WARNING! The batteries (especially auxiliary batter-
ies) contain an oxyhydrogen gas mixture which is
very explosive. A spark generated by connecting the
jumper cables incorrectly is sufficient to explode a bat-
tery and cause personal injury and damage.
Electrical system
149