Originally Posted by gstent
Yes warning lights are off (and never came on apart from usual start up procedure)
Only on one engine
- other fine (Lagoon450)
Thanks for the info
OK, I don't have a 4JH5E manual but I do have the 4JH4 manual (along with several other Yanmar
manuals). The Yanmar alarm
design philosophy / methodology is very similar across their range of small marine
engines so I am confident that what I have written below will pertain to your engine
. Note, there are some options mentioned that might not be fitted to your installation
but nevertheless, the loom includes the provisional wiring
for these options and as such, may give rise to a fault symptom.
There are five possible alarm
inputs that will trigger the buzzer (and light an idiot lamp).
1. low oil
2. high coolant
in sail drive seal
in fuel filter
5. insufficient raw water
If the alarm sounds and there are no lights on, check the bulbs.
You can trouble shoot the alarm system without the engine running simply by turning on the key switch and disconnecting the wire on the low oil
pressure switch on the engine. If all is normal, this should stop the low oil pressure alarm form sounding.
If the buzzer remains on, then trouble shoot each of the remaining four circuits (above).
Each one works the same way. There is a sensor for each circuit - find the sensor and disconnect the wire from it. The alarm and it's associated light should be OFF. Now connect the wire temporarily to ground (battery -ve). the buzzer should sound and the light should illuminate.
Keep removing each sensor wire (at the sensor) until the buzzer stops - this is the faulty circuit.
Remember to refit
all the removed wires before closing up - especially the low oil pressure one!