Specifications

34
CD549
71891
1
AUDIO
TEST
ABCDE
71891
2
AUDIO
TEST
CD550
1 Engine System Monitor Features - The appropriate light functions as follows:
A Preheat Indicator Lamp - lights up when the glow plugs are preheating the combustion chambers. The timed
preheat period begins when the key switch is turned on. THE ENGINE SHOULD BE STARTED ONLY AFTER
THE LAMP GOES OFF.
B Charge Indicator Lamp - indicates a problem with charging system if lamp illuminates while engine is running.
Lamp will light when key switch is “ON” and engine is not running. When engine starts, light should go off.
C Oil Pressure Warning Lamp - indicates low engine oil pressure, if lamp illuminates while engine is running,
or sterndrive gear lube oil level low.
NOTE: The oil pressure warning lamp is wired in a parallel circuit with the gear lube monitor bottle switch. If lamp
illuminates while engine is running, and oil temperature and oil level are normal, this may be an indication of low
oil level in the gear lube monitor bottle. The cause should be determined and corrected.
D Coolant Temperature Warning Lamp - indicates excessive engine coolant temperature if lamp illuminates
while engine is running.
E Check Engine Lamp - if Check Engine light illuminates during operation it may indicate an abnormal condition
has been detected by engine sensors, the system can be reset by turning off and re-starting the engine. If
the lamp illuminates again shortly after re-starting the engine contact the nearest MerCruiser Service Center
for diagnosing the problem.
2 Panel Lights/Audio Test Switch - has three positions; in the normal position all electrical circuits operate
in a standard fashion (as described above). With switch toggled “UP” the instrumentation lights are all illumi-
nated. When the engine is running and the switch is toggled “DOWN” the audio warning buzzer will sound allow-
ing the operator to perform a test of the audio warning buzzer.