Engine Panel red warning lights

[Neasden]

We have a 1997 Hunter 340 with a Yanmar 3GM30F engine and are in the process of replacing the Engine Panel. The original red bulbs had long ago gone to bulb heaven and we have been a little surprised as and when they now light up. We would like any help or comments as to what activates them.
We think their working is as follows:
Oil Can light: - Related to oil but is it low oil pressure or oil level?
Battery light: - Related to Alternator and lights when the Alternator is not charging?
Thermometer: - Related to coolant but don't know if it is low coolant level or Coolant high temperature?
Any help or guidance will be much appreciated.

gm 3030

 

[Ed Caldwell]

Oil Can light: low oil pressure
Battery light: Alternator is not charging
Thermometer: Coolant high temperature

 

[jssailem]

Oil Can light: - Related to oil but is it low oil pressure or oil level?
Battery light: - Related to Alternator and lights when the Alternator is not charging?
Thermometer: - Related to coolant but don't know if it is low coolant level or Coolant high temperature?

 

[kloudie1]

Welcome to the group! Lots of great info here.. check out the "Owner Resources" section and "General Downloads" also check out the model specific stuff for your 340..
Oil can is "Low Oil Pressure" it will illuminate and sound the alarm when the engine is not running.. it should turn off as soon as oil pressure builds as the engine spins. it will come back on when you shut down the engine.
Thermometer is "High Engine Temperature" Illuminates and sounds alarm when the coolant temperature is too high.. doesn't on startup..
Battery is same as car, alternator not charging.. usually not hooked to the alarm but illuminates when no charge as in engine off..
When you turn the key on, it powers up the circuits; the pressure and temp lights are turned on by the sensor grounding the 12 V circuit, turning on the horn alarm..
HAPPY sailing !! and again, Welcome

 

[Neasden]

Thank you everybody for your help. I will now rest a little easier when our red lights flicker.

 

[Richard19068]

Well, you should really only rest easy when the red lights don't flicker .

 

[ggrizzard]

As Richard implied and I'll say flatly:
DO NOT REST EASY until you have properly operating idiot lights or
have added real gauges for oil pressure and water temperature.
If you don't, you won't know if one or the other flickering lights means:
1. A simple light bulb / wiring connection problem,
2. A failing sensor,
OR
3. A serious oil or water or charge disaster waiting to happen,
like on a lee shore in a blow!