Volvo Penta D1-13 Workshop Manual page 8

30-0 General
Check all connectors visually
Look for the following:
• Look for oxidation which can impair contact in
connectors.
• Check that terminals are undamaged, that they
are correctly inserted into their connectors, and
that the cable is correctly terminated in the ter-
minal.
• If possible, shake the cables and pull the con-
nectors during measurement to discover
whether the cable harness is damaged.
• Check that the cables are not damaged. Avoid
clamping cables in tight bends close to the con-
nector.
Contact problems
Intermittent contact or occasional recurrent faults can
be difficult to trace and are often caused by oxidation,
vibration or poorly connected cables.
Wear can also cause problems. For this reason, avoid
disconnecting a connector unless necessary.
Other contact problems can be caused by damage to
pins, sleeves and connectors etc.
Shake the cables and pull on the connector during test
measurements to find where the cable is damaged.
Contact resistance and oxidation
The resistance in connectors, wiring and splitters
must be approx 0 Ω. However, there is always a cer-
tain resistance in connectors due to oxidation.
However, if the resistance is too high problems will
occur. The amount of resistance that can be tolerated
before a fault occurs varies depending on circuit load.
6
Fault tracing of cables and connectors
Tools:
88890074 Multimeter
Open circuit
Possible fault causes can be defective or chafed
cables or loose connectors.
Use the wiring diagram to check the cables that are
relevant to the function. Begin with the most probable
cable in the circuit.
Look for the following:
• Disconnect the relevant connector at both ends
of the harness.
• Use 88890074 Multimeter to measure the resist-
ance between the cable ends.
Nominal value ~ 0 Ω.
• If possible, shake the cables and pull on the
connectors during test measurements to deter-
mine whether the harness is damaged.
• Check the next cable system in the wiring dia-
gram if no fault is found.
Electrical Welding
Remove the positive and negative cables from the
batteries. Then disconnect all connections to the alter-
nator, starter motor and the MDI.
Connect the welder ground clamp to the component
to be welded, or as close as possible to the weld site.
The clamp must never be connected to the engine or
in such a way that current can pass through a bearing.
IMPORTANT!
When welding is finished the alternator cables must
be reconnected before the battery cables are con-
nected.
Starter motor
Starter motor fault tracing must be assigned to an
authorized marine electrical workshop with the nec-
essary test equipment.
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