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Constant Low Tone Alarm

juniorislander

New member
Hi All, looking for some help.

I bought a used 2006 boat with a 4.3 GXI. I have a very low sounding constant audible alarm when ever my key is on. It is there if the engine is running or not. All my fluid levels are good. No issues showing on my gauge cluster. I pulled the sensor off each exhaust manifold and the thermostat one by one but the alarm never stopped. Any one got any ideas where I go from here?
 
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