Yanmar 4JH5E control panel turns off when running.... and other problems

[Genoa]

... I am sailing in a fairly remote part of Sweden and have an intermittent problem. Any ideas?
First noticed an issue when I came to leave a quay and the bow thruster just clicked. Inconvenient but ok.
Then when motoring out of the rocks, noticed the engine control panel had shut down, no lights, no tachometer.
But engine seemed to be running fine.
Next destination, went to drop bow anchor on leccy windlass. No joy.
At next stop over, everything working so back to wilderness - leccy panel not working so couldn’t use electric stop button.
Whilst pondering this panel came back to life, and I stopped it on the button.
First thing in the morning, engine started, panel lit and tachometer good, bow thruster worked, windlass ok. Then panel went dead and thruster and windlass are no more.
1st question: is this my manual engine stop - pic 1
2nd question as you can see in pic2 no sign of any corrosion in control panel or immediate connectors, likewise at engine,so any other ideas what to try?
Pics to follow as connect not fast!

 

[Genoa]

Pic 1

 

[Genoa]

Pic 2

 

[VicS]

Item 1 is the emergency stop button
( this diagram is in your owners manual)

My money for the cause of you problems is on a dodgy key switch or connection on it ( assuming your panel has a key switch). Both the panel power supply and the stop button are supplied from the AC terminal.
You do seem to have a lot of other equipment with the power supply controlled by the key switch. Hopefully via relays otherwise the load on the keyswitch may be burning it out.

If you have a keyless panel further study of the wiring diagrams will be needed but I'd suspect a similar reason

 

[Genoa]

Thanks Vic.
Thanks for the diagram. I had a copy of a copy that wasn't clear but had found the right place.
As to the panel, it is keyless but I suspect you are right. Further investigation underway....

 

[VicS]

Thanks Vic.
Thanks for the diagram. I had a copy of a copy that wasn't clear but had found the right place.
As to the panel, it is keyless but I suspect you are right. Further investigation underway....

Good luck following the wiring diagram for that

I think look at the OFF ON START switch but begin by checking the power supply to it. You might have to chase that right back to the battery, A bulb on a couple of leads is often more reliable for this type of checking because digital multimeters take so little current that they can show a normal reading even through a bad connection

 

[Genoa]

Thanks vic.
Turns out I had a bad earth!
10 minutes with the right idea of start circuit.