Page 1 of 1

Engine room Fire Suppression - Conntected to Engine run?

Posted: May 14th, 2026, 6:17 pm
by kgarguilo
Hello everyone, hope you are all well and getting out on the water.

On my 99 Carver 406 I have a FireBoy CG2-475 Halon fire suppression system with a Test button at the helm. Press the test button and it blinks red and piezo horn makes noise. Disconnect wires from the System and the Test button Illuminates and Piezo Horn makes noise. I was getting it inspected today by a local company and the guy asked me if it was wired to kill the engine power if the suppression system was activated. Does anyone know if in 99 Carver 406 was wired the suppression system through the engine starting switch? Below are pictures of the unit in the engine room.

I am guessing I could trace those wires but, that may be difficult not knowing if they would go to the helm or the Mefi 3 Controls? Any guidance would be helpful. Thanks in advance.

More info just in case it matters:
  • Mercruiser 7.4L MPI MIE V-8 gasoline naturally aspirated engine
    Kohler 8E 120V 60HZ gasoline
[image]
20260204_103126.jpg
[image]
[/image]
20260204_103033.jpg
[/image]
[image]
20260204_103106.jpg
[/image]
[image]
20260204_103044.jpg
[/image]
[image]
MEFI - 3 DLC.png
[/image]

Re: Engine room Fire Suppression - Conntected to Engine run?

Posted: May 14th, 2026, 9:39 pm
by Viper
I've seen that feature usually hooked up to diesel application, gassers not so much but who knows what was done in the past, the options paid for from factory or at the dealership when she was first sold.

Re: Engine room Fire Suppression - Conntected to Engine run?

Posted: May 15th, 2026, 1:56 pm
by km1125
Not sure I'd want it to automatically kill the engine(s)

Re: Engine room Fire Suppression - Conntected to Engine run?

Posted: May 15th, 2026, 8:43 pm
by Viper
The system is design to shut down the engines when the extinguishers are activated otherwise the engines will ingest what the extinguishers have discharged, rendering the suppression system useless and allowing the fire to reignite. It's especially important on diesels because of the volume of air their breath. It's possible to have a fire in the engine bay and not know about it while you're underway, so it's a good feature to have in both gasoline and diesel apps so the extinguishers can do their job properly. The downside of coarse is that it's another system that can fail and prevent engine starts or cause shutdowns under normal conditions, but the safety benefit outweighs that IMO.