Alternator - Volvo Penta D2-55 Workshop Manual

Group 30 Electrical system
82
Checking negative (-) battery lead
1. Connect the multimeter between the alternator
connections B- and battery negative 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".
Actions
WARNING! Disconnect power and remove both
battery cables before working on the charging
circuit.
If the voltage drop in any of the tests above exceeded
0.2 V, the battery leads/connections must be removed
and cleaned from oxide etc. They spray the connec-
tions with a moisture dispersent contact oil and tight-
en the connections once more.
Treat the connections at the battery, main switch,
starter motor, alternator, glow plug relay and glow
plugs.

Alternator

Checking and fault tracing the alternator
1. Remove the alternator's electrical connections.
Remove the alternator belt. Remove the alternator.
2. Undo the voltage regulator's connection at the al-
ternator connection B+. Unplug the blade connec-
tors at connections B+ and D+. Remove the pro-
tective cover from the W connection.
3. Lever the plastic cover fixing ears from side to
side off the alternator. Undo the regulator's con-
nection cables to the diode bridge. Use flat pliers
or poke the cable shoes out with a screwdriver.
Do not pull on the cables!