Beta Marine BV1305 Operation And Maintenance Manual page 24

ELECTRICAL FAULT FINDING – DELUXE C & WATER TEMPERATURE FUNCTION
ON B PANELS
In addition to the fault finding detailed on the previous table, the following is specific for the C deluxe panel (Also
applicable for the B panel with Murphy water temperature gauge)
PROBLEM
Oil pressure warning lamp not functioning,
oil pressure gauge showing maximum
deflection. Engine off and keyswitch in run
position
Oil pressure gauge showing no movement -
even when engine is started. Warning lamp
functioning correctly
Oil pressure showing no movement,
Warning lamp not functioning correctly
Oil pressure showing normal operating
pressure (0.75–5 bar). Buzzer sounding &
lamp illuminated.
Water temperature gauge showing
120°C / 250°F
THIS ALSO APPLIES TO THE B PANEL
WITH MURPHY GAUGE
Water temperature gauge showing normal
operating temperature (85°C). Buzzer
sounding & lamp illuminated.
THIS ALSO APPLIES TO THE B PANEL
WITH MURPHY GAUGE
Water temperature gauge showing no
movement, lamp not illuminated, engine
warm.
THIS ALSO APPLIES TO THE B PANEL
WITH MURPHY GAUGE
POSSIBLE CAUSE & SOLUTION
• Faulty wiring –check wire connection & continuity (small white/brown) from
sender to panel lamp. Ensure this connection is not shorting to earth (ground).
• Faulty wiring –check oil pressure sender wire (small white / brown) is connected.
• Check connection to oil pressure gauge, if plug is not connected to socket on rear of
gauge reconnect.
• If all connections are correctly made, possible faulty sender unit –check resistance to
earth (ground) approx. 50Ω. Replace if no reading or short-circuited.
• If adjusted correctly & buzzer still sounding, possible faulty switch gauge unit –
replace.
Engine warm:
• Incorrectly calibrated switching point for warning lamp, adjust on rear of gauge to
0.5 bar (minimum adjustment on gauge).
• If adjusted correctly & buzzer still sounding, faulty switch gauge unit – replace.
Engine cold / cool:
• Faulty wiring, check water temperature sender wire is not shorting to earth
(ground)
• Faulty sender unit, –check resistance to earth, approx. 3.5kΩ (cold) – 0.5kΩ
(warm). Replace if notably less.
Engine warm:
• Incorrectly calibrated switching point for warning lamp, adjust on rear of gauge to
100°C/210°F.
• If adjusted correctly & buzzer still sounding, faulty switch gauge unit – replace.
• Check connection to sender, if disconnected gauge will not function.
• Check connection to temperature gauge, if plug is not connected to socket on
rear of gauge reconnect.
• If all connections are correctly made, faulty sender unit –check resistance to
earth, approx. 3.5kΩ (cold) – 0.5kΩ (warm). Replace if no reading.