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2004 Merc 575 warning siren won't go away

Old 07-14-2016, 07:35 PM
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Default 2004 Merc 575 warning siren won't go away

It has 76 lbs oil pressure, 110 oil temp and 140 water temp . 30 psi fuel pressure runs great. Just all of a sudden it stays on?? any Ideas
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Old 07-14-2016, 07:37 PM
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all I did is replace fuel lines on the throttle body.. ( on both engines)
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Old 07-15-2016, 08:24 AM
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Mine had the same problem, it was a wet oil pressure sensor, a different one than the gauge uses.
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Old 07-15-2016, 08:39 AM
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Im assuming their efi ? if so fuel pressure seems low for, should be in the low 40's, are they bravo drives ?? drive reservoir low ? solid tone or interupted

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Old 07-15-2016, 09:18 AM
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It sounds like intermittent and solid both cause it changes a little art first. It only comes on after the high idle . It does not come on in the first 10 seconds or so. It will not go away at any rpm. Maybe it is a sensor for low pressure like J rider said? Unhooked the drive reservoir sensor wires and it's half full too.
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Old 07-15-2016, 09:23 AM
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what sensors does it have that set that off? I would think oil pressure for sure, water temp for sure . it there more than that to check?
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Old 07-15-2016, 09:25 AM
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That's a make switch on the drive bottle, when unhooked the circuit is open and will alarm, did you hook the wires together to close the loop
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Old 07-15-2016, 10:46 AM
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Originally Posted by 33outlawsst
That's a make switch on the drive bottle, when unhooked the circuit is open and will alarm, did you hook the wires together to close the loop
That's what I thought . Thank you. The guy at the dock was telling me it was the other way
. I will try it
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Old 07-15-2016, 05:41 PM
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Originally Posted by 33outlawsst
Im assuming their efi ? if so fuel pressure seems low for, should be in the low 40's, are they bravo drives ?? drive reservoir low ? solid tone or interupted
It is not a high pressure EFI system, that pressure is fine. It has two 90s throttle bodies off dump truck motors...true story.
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Old 07-15-2016, 05:43 PM
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Originally Posted by mcprodesign
That's what I thought . Thank you. The guy at the dock was telling me it was the other way
. I will try it
Unplug to bypass alarm
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