INSTALLATION
EN / Alpha alternator - Alpha Pro regulator / June 2007 13
5 See reference g. The brown cable of the cable
harness must be connected to the [reg on]
terminal of the Alpha Pro regulator. Connect the
other wire end through a switch (“S1”) with
normally open contacts to the positive (+) pole of
the battery as indicated. You can use the ignition
switch (figure 7) or preferably an independent
(ungrounded) oil pressure switch (figure 8). Use
a 2.5mm² cable. This cable must also be
secured by a 2 Amp fuse. As the [reg on]
terminal is also used for voltage measurement,
this cable should not be shared with other loads.
CAUTION!
If the engine is not running switch “S1”
must be open, otherwise the field
windings of the alternator will be
damaged due to overheating.
NOTE!
An additional toggle switch may be added
in series with switch “S1” to shut down
the alternator manually when increased
propulsion is needed.
Figure 7: Connection of the ignition switch
Figure 8: Connection of an independent
(ungrounded) oil pressure switch with normally open
contact
6 See reference h. The blue wire of the cable
harness is the field connection of the alternator.
Connect this wire to the [field] terminal of the
Alpha Pro regulator.
NOTE, only applicable for non-Mastervolt
alternators: With most other brands there
is an internal connection between the
negative field terminal of the alternator
(D–) and the alternator housing (GND).
Be sure to remove this connection before
installation. See APPENDIX section 2.5.
7 See reference i. Attach the temperature sensor
to the battery and connect the RJ12 connecter to
the Alpha Pro regulator as indicated.
reg on
Positive
battery pole
Normally open oil
pressure switch
2 Amp
S1
Ignition switch
reg on
Positive
battery pole
Relay
2 Amp
S1