Fixing a boat help

[makeitfit]

Here's one I might have asked uncle Rustic but here goes. I'm trying get the engine hours display to work, or find a way if reading them.
Twin Volvo Penta 3 pot diesels. Twin controls and twin hour readout, both not reading out ???
I don't know where the signal would come from bug suspicious as both are out/ failed.
It's a bit like a car with no odometer reading.

https://ibb.co/bBH6EH

https://ibb.co/khY2oc

All connections clean and present as far as I can see .
Any top tips guys 🤔

[macabethiel]

No idea but firstly would be checking for power to the display unit. As you are aware LED displays can fade quickly with time. I am guessing the clock will only be live when the engine is running or if there is such a thing when the ignition is ON.

Loads of various model displays on the net.

Most LED's seem to pack up when 20 years old or more if applicable.

[Terrano Steve]

Hour clocks on tractors & plant operate off the wire on the alternator (usually marked ind ) which goes to the warning light on the dash. So only able to clock hours when engine is running.

[makeitfit]

Hour clocks on tractors & plant operate off the wire on the alternator (usually marked ind ) which goes to the warning light on the dash. So only able to clock hours when engine is running.

That's kinda what I got from Google. It seems the original alternators have been replaced at some time. Maybe these new ones don't have the same take off point for hour log ?

[Terrano Steve]

Not all alternators need an exciter to start them charging so you may be right but if it still has the warning light wired in & working you should be able to use that.