TROUBLE SHOOTING
EN / Alpha alternator - Alpha Pro regulator / June 2007 21
7 TROUBLE SHOOTING
In case of any fault, we recommend consulting the Maintenance section first (see section 6). If you cannot solve a
problem with the aid of the table below, contact your local Mastervolt Service Centre. See www.mastervolt.com.
PROBLEM POSSIBLE CAUSE SOLUTION
• Battery fuse blown.
Investigate the cause of this malfunction.
Then replace the fuse.
• Battery connections are corroded
or bad.
Clean and tighten the connections. If the
cables are burned, replace them.
No voltages at all. All LED’s
of the Alpha Pro regulator
are off.
• Black [gnd] wire is loose
Check black [gnd] wire (reference 2 on
the installation drawings).
• Engine is not running
Start the engine
• 2 Amps fuse in brown wire is blown Check the 2 Amps fuse and replace if
necessary.
No output power, all LED’s
of the Alpha Pro regulator
are off. Voltage on the [+bat]
terminal is 12/24V Voltage
on the [reg-on] terminal of
the regulator is 0V
• Problem with the oil pressure
switch or ignition relay (S1) or
brown [reg on] wire is loose
Check voltage on [reg on] terminal of the
Alpha Pro regulator. Check brown [reg on]
wire. Check the oil pressure contact or
ignition relay for correct operation
• 10 Amps fuse in the red wire blown
Check the 10 Amps fuse and replace if
necessary.
• Two pole field connector of the
cable harness is loose (red and
blue wire)
Check field connector on the alternator
(reference 3 on the installation drawings).
• Problem in the wiring
Check red and blue wires to the field
connector
• Blue [field] wire is loose
Check blue wire (reference 6 on the
installation drawings)
No output power, one of the
LED’s of the Alpha Pro
regulator is on. Voltage on
the [field] terminal of the
regulator is 0V
• Field windings of the alternator are
defective.
Check resistance of field windings.
Replace alternator
• Black [gnd] wire is loose
Check black [gnd] wire (reference 2 on
the installation drawings).
No output power, All LED’s
of the Alpha Pro regulator
are off. Voltage on the [reg
on] and the [+bat] terminal of
the regulator are both
12/24V
• Alpha Pro regulator defective
Replace Alpha Pro regulator
• An alternator driven tachometer
may reduce its reading or fluctuate
when the Alpha Pro regulator
makes a transition from absorption
to float if the battery is fully charged
with no loads or if the float voltage
is set quite low.
Nothing, this is a normal situation. To
avoid this, you may switch on some loads
• Engine speed is too low
Increase engine speed
Tachometer indication is too
low or fluctuates
• Wrong calibration of the
tachometer
Adjust tachometer according to pulley
ration
• Alternator is overloaded.
Switch off a load; (part off) consumers. Regulator stays in bulk mode
all the time (Bulk LED stays
on)
• Defective batteries, short-circuit
between cells
Check batteries and replace if necessary
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