Volvo Penta D2-55, Workshop Manual

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81
Group 30 Electrical system
Checking the battery leads
Set the multimeter to voltage test and connect the
multimeter between the battery’s positive and nega-
tive poles. Run the engine at 2000 r.p.m. Read off and
note the voltage across the poles.
The alternator delivers approx.14.0 V:
Perform the test as follows:
1. Connect the multimeter between the alternator
connections B+ and B-.
2. Run the engine at 2000 r.p.m. The alternator shall
deliver 14.0-14.4 V. The total voltage drop shall
not exceed 0.4 V.
Voltage drop less than 0.2 V:
Battery leads OK.
Voltage drop more than 0.3 V:
Perform a check of the battery leads.
The alternator supplies more than 14.4 V:
See sections “Checking and Fault Tracing the Al-
ternator”, and “Checking the Regulator”.
Checking the positive (+) battery lead
1. Connect the multimeter between the alternator
connection B+ and the battery positive pole.
2. Run the engine at 2000 r.p.m. The voltage drop
shall not exceed 0.2 V. If the voltage drop ex-
ceeds this, the battery lead/connection must be
remedied according to “Actions” below.
Then perform the test for “Check of the negative
battery lead”.