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Old 11-08-2020, 10:30   #1
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Join Date: Jan 2010
Location: London UK
Boat: Lagoon 440
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Dead Instrument Panel Yanmar 4JH4E

Hi,

The panel is working fine today. Yesterday I lost power to all parts of the panel including the fuel gauge. Yet the engine started normally. Also, I lost power to the windlass (it needs the port engine running for the windlass to be energised)

I suspected the wiring harness next to the engine. This consists of five multi wire connectors that appear difficult to take apart without a special tool? Has anyone opened these up?

Because the windlass wouldn't work I suspected the harness at the engine rather than a fault at the panel. Apart from WD40 what else can I do if I can't get those connectors open?

Thanks in advance.
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Old 11-08-2020, 12:19   #2
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Re: Dead Instrument Panel Yanmar 4JH4E

I suspect the windlass is a separate issue. It should not have anything to do with the engine wiring. I'd pull the panel and look for a bad ground or broken wire. You can find the wiring diagram for your engine and panel. Everything is color coded.
I'd run a temporary wire from a good ground to the panel to rule it in/out.
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Old 11-08-2020, 23:25   #3
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Re: Dead Instrument Panel Yanmar 4JH4E

The two may or may not be related, but it sounds to me like you have a loose or corroded main battery cable connection somewhere.

There are many, many dfferent styles of multipin connectors, but they all generally have a push or pull tab, or some such combination of devices to release them. A careful examination of the connector should reveal it's 'secret', and a shot of whatever miracle spray you have handy should persuade it to seperate.
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