Beta Marine BV1903 Operator's Maintenance Manual page 20

Electrical fault finding –all lamp panels
Problem
No warning lamps or buzzer functioning,
engine will not start or stop
Non function of warning lamp
THE WATER TEMPERATURE LAMP
WILL NOT FUNCTION UNLESS
ENGINE IS OVERHEATING OR THERE
IS A WIRING FAULT
Water temperature warning lamp on
when engine is not over temperature
(Not 2B or 2C deluxe panel see table on
following page)
Buzzer not functioning
THE BUZZER WILL NOT SOUND FOR
GREEN POWER ON LAMP
Starter battery charge lamp not
functioning
Tacho not functioning
Domestic charge lamp not functioning,
buzzer remains on with engine running
Domestic charge lamp not functioning,
buzzer switching off with engine running
THIS LAMP WILL NOT FUNCTION IF A
SINGLE ALTERNATOR IS FITTED TO
THE ENGINE
Possible cause & solution
- Battery isolation switch in off position –switch on
- Starter battery discharged – charge
- Engine fuse blown –check fuse (above starter motor or
flywheel housing) & replace if necessary.
- Check for wiring faults.
- Disconnect switch wire to non-functioning lamp:
green/blue –water temperature, white/brown –oil
pressure, brown/yellow –alternator charge. Reconnect
wire temporarily to another warning lamp that is
functioning; if wire switches lamp on replace faulty lamp.
- Disconnect positive feed to non-functioning lamp.
Reconnect temporarily with wire from another warning
lamp that is functioning, if wire switches lamp on rewire
with new connection.
- If none of the above, check continuity of connections
from panel to engine.
If engine is cold:
- Faulty wiring, check connection & continuity (small green
/ blue) from switch to panel lamp. Ensure this
connection is not shorting to earth (ground).
- Faulty temperature switch –if lamp switches off on
removal of connection to switch unit, replace.
If engine is warm:
- Switch wire connected to large sender terminal of switch
/ sender unit. Remove and refit to smaller (switch)
terminal
- If lamp is functioning but buzzer not sounding, check
connection & continuity from illuminated warning lamp
(red not green) to buzzer board.
- Faulty warning panel buzzer board –replace.
If tacho not functioning:
- Alternator not connected properly, check continuity of
small brown wire from rear of alternator to 'AC' position
on keyswitch.
- alternator connected properly, faulty alternator –replace
If tacho functioning correctly:
- Check continuity of small brown/yellow wire from rear of
alternator to no charge warning lamp on rear of panel.
- If alternator connected properly, faulty panel warning
lamp –replace
- Check connections on rear of tacho, especially
black/blue wire, terminal '4'
- Check connection of black/blue wire on rear of 1
alternator (W connection, usually a bullet on flying lead,
or lowest connection on alternators with 3 pin coupler)
- Check continuity of black/blue wire from alternator to
tacho
- Measure voltage from alternator W connection to earth
(ground), should be approx. 7.5 – 9.0 volts AC
- Domestic battery not connected
- Domestic battery not connected correctly:
B+ to domestic isolation block on starboard rail (port on 75 & 95hp)
B- to engine earth (ground)
- Domestic battery flat
- Panel relay faulty / incorrectly wired:
Check voltage at relay terminal 86, white wire is positive feed
for warning lamp from AC position of keyswitch.
- No second alternator fitted to engine, domestic lamp not
used
- D+ (charge indication) lamp connection at rear of
alternator not connected
- Two way plug & socket disconnected between engine
harness & panel loom
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