Electrical system
Procedure
Checking the battery leads
A
Set the multimeter for voltage testing and then connect
the multimeter between the battery�s plus and minus
pole. Run the engine at approx. 2000 rpm. Read off and
note the voltage over the battery poles.
WARNING! Disconnect the current and remove
both battery leads before working on the charging
circuit.
If the voltage drop during any of the tests as per the
items above exceeds 0.2 V the lead connections must
be removed and cleaned from oxide etc. Spray the con-
nections with a moisture repellant contact oil (Volvo
Universal oil, part. No. 1161398-1) or the like and tight-
en the connection again.
The alternator provides approx. 14.0 V:
Conduct test as follows:
Connect the multimeter between the alternator�s B+ and
B- connections.
Run the engine at approx. 2000 rpm. The alternator
should provide 14.0-14.4 V. The total voltage drop
must not exceed 0.4 V.
Rectify the connections at the battery, main switch,
starter motor, alternator, glow relay and glow plug.
Voltage drop less than 0.2 V:
Battery leads in good condition.
Alternator
Voltage drop more than 0.3 V:
Conduct check of battery leads.
Checking and troubleshooting of the al-
ternator
Dismantle the alternator�s electrical connections.
Spanner widths 8 and 10 mm.
The alternator provides more than 14.4 V:
Remove the alternator belt. Dismantle the alternator.
Spanner widths 1 1/16"; 5/8"; 12 mm and 13 mm.
See items "Checking and troubleshooting of alternator"
and "Checking of the regulator".
Release the voltage regulator�s connections at the alter-
nator�s B+ connection. Remove the flat pin at connec-
tion B+ and D+. Remove the cap on the W connection.
Bend the plastic guard�s attachment lugs alternately off
the alternator. Release the regulator�s two connection
cables to the diode bridge. Use long-nose pliers or poke
out the cable lugs with a screwdriver. Do not pull the
Checking of positive battery lead
Connect the multimeter between the alternator�s B+
connection and the battery�s plus pole.
cables!
Run the engine at approx. 2000 rpm. The voltage drop
must not exceed 0.2 V. If the voltage drop exceeds this
value the lead connections must be rectified as per the
"Procedure" below.
Replacement of carbon brushes in the
alternator
After this carry out a test as per "Checking of negative
battery charging".
Unscrew the voltage regulator. Unscrew the brush hold-
er. Check the length of the carbon brushes. Replace the
brushes if they are 5 mm (.1968 in) or shorter. Carbon
and holder are replaced as one unit. Unsolder the con-
nection cables and solder on the new ones with an
acid-free soft solder.
Checking of negative battery lead
Connect the multimeter between the alternator�s B-
connection and the battery�s minus pole (-).
Run the engine at approx. 2000 rpm. The voltage drop
must not exceed 0.2 V. If the voltage drop exceeds this
value the lead connections must be rectified as per the
"Procedure" below.
74
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD2010, Volvo Penta MD2020, Volvo Penta MD2030, Volvo Penta MD2040 |
| Download File |
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| Copyright | Attribution Non-commercial |
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