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ELECTRICAL FAULT FINDING - ENGINES AFTER JULY 2005 ONLY
The following chart is compiled to aid diagnosis of
electrical faults, based on the Beta 10 - 90hp range of
engines. If your engine was built before July 2005,
contact Beta Marine for the relevant electrical trouble
shooting guide.
Note: our standard control panels are for earth return
installations only (where battery negative cable is
connected directly to engine ground). For insulated earth
(where battery negative cable is isolated from engine
ground) different harnesses, alternators, switches for oil
pressure and engine temperature are fitted.
Standard sea specification engines (heat exchanger
cooled) are supplied with a single alternator, mounted port
side, supplying power to starter battery and control panel.
Standard canal specification engines (keel cooled) are
supplied with twin alternators:
• 1st alternator, mounted port side, supplying power to
starter battery and control panel
• 2nd alternator, the standard mounting position for this
is above the engine on the starboard side (or below
1st alternator on 75 and 90hp), supplying power to
the domestic battery system.
Both of these alternators work independently, if the
domestic battery system is disconnected, the engine will
still run correctly but:
• Domestic charge warning lamp will not function
• Warning buzzer will remain on at all times
Note: The two way plug on panel loom will only have a
corresponding socket to connect into from the engine if a
2nd alternator is fitted which requires this connection.
Engines with only one alternator do not utilise this
connection.
Battery positive
54
Battery negative
STANDARD KEYSWITCH CONTROL PANELS ARE
SUPPLIED WITH FOUR OR FIVE LAMPS.
Four lamp panels: A, ABV, B these panels utilise
bulbs inside sealed lamp holders.
Five lamp panels: AB and C; these panels also utilise
bulbs inside sealed lamp holders, having an additional
lamp for 'domestic battery charge'.
HEAT
With keyswitch* in run position and engine off:
Red lamp for 'low oil pressure' should
function.
Red lamp for 'high engine temperature'
should not function (when engine is
cold/cool/warm).
This lamp will only ever function if the
engine is over temperature.
Red lamp for 'no starter battery charge'
should function.
Red lamp for 'no domestic battery charge'
should function (Note: this will only
function if a second alternator is fitted to the
engine and connected to a charged battery).
Green lamp for 'panel power on'
should function.
Buzzer should sound.
48
OFF
RUN
START
55
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