Section 7 - Troubleshooting
Page 142 90-866938081 MAY 2009
Possible Cause Remedy
Alternator drive belt loose or in poor
condition.
Replace or adjust belt.
Unacceptable battery condition. Test battery.
Battery charge switch off Turn the battery charge switch on.
Shore power not on
Check the condition of the connections, cables, and shore power
supply. Repair or replace as necessary.
Gauges and Instrumentation
Possible Cause Remedy
Gauges not working
Key off and key on.
Contact your Authorized Cummins MerCruiser Diesel Repair Facility.
Galvanic Isolator
Symptom Possible Cause Remedy
RED light on. One blink from
GREEN light
Open capacitor in Galvanic Isolator. Replace Galvanic Isolator.
RED light on. Two blinks from
GREEN light.
Shorted diode in Galvanic Isolator. Replace Galvanic Isolator.
RED light on. Three blinks from
GREEN light.
Open diode in Galvanic Isolator. Replace Galvanic Isolator.
RED light on. Four blinks from
GREEN light.
Open connection between Galvanic Isolator
and Monitor. Defective Galvanic Isolator.
Defective Monitor.
Check wiring. Replace
Galvanic Isolator. Replace
Monitor.
RED and GREEN light
alternately blink.
Alternately Open safety wire to shore. Open
boat wire bonding.
Check wiring.
GREEN light on. RED light
blinks once or twice per second.
AC fault current is being passed through
safety wire (once per second‑less than 8
AMPS).
Check for improper AC
polarity. Check for defective
AC device.
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