Engine Alarm Mystery & Resolution – Loose Wire Behind the Binnacle
Mike Maksimchuk
Hey all,
Wanted to share a recent experience with our Catalina 355 (Amadeus, #94) in case it helps someone down the road with a similar issue.
The Problem:
We were out for our season shakedown sail last weekend—engine started up fine at the dock and idled smoothly. After a great sail around White Lake, I fired the engine back up to motor toward Lake Michigan. About 1–2 minutes after startup, the alarm buzzer went off unexpectedly. No warning lights came on (no high temp, no low oil pressure), but it definitely startled everyone onboard.
Water temp was reading normal (~150°F), voltage looked good (~13.5V), and the engine was spitting water just fine from the exhaust. Oil level and coolant levels were nominal, per the dipstick and the coolant reservoir. We shut the engine down and sailed back in.
Initial Troubleshooting:
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Cleaned out the raw water strainer and confirmed good flow through the intake hose.
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Checked coolant and oil levels—both normal.
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Verified the raw water impeller was intact and looked good.
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Blew air through the intake hose with a shop vac to clear any possible blockages.
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Used a multimeter to check the oil pressure sender before and after engine start—confirmed that it was functioning properly.
Still, the alarm would return within a minute of starting, with no indicator lights.
The Fix:
This weekend I decided to dig a bit deeper and removed the gauges from the binnacle. Sure enough—I found a disconnected wire behind the instrument panel, which I believe was the cause of the phantom alarm. It went from the low oil pressure to the alarm.
Once reconnected, everything worked exactly as expected—alarm behaved normally on startup, oil pressure light came on before cranking and turned off once the engine fired.
Final Thoughts:
Sometimes it really is a loose wire. I’m posting this in case anyone else experiences:
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An alarm buzzer going off shortly after startup
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No indicator lights triggering
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All engine readings appearing normal
Check the connections behind your panel—it might save you a lot of head-scratching. Thanks to everyone who’s contributed to past threads—this forum is a great resource!
295 Indian Bluffs NE | Sparta, MI 49345
email: mtma...@mtu.edu | mobile: (231) 225-5060
ken magida
Sent: Sunday, June 1, 2025 20:28
To: catal...@googlegroups.com <catal...@googlegroups.com>
Subject: [Catalina 355:5769] Engine Alarm Mystery & Resolution – Loose Wire Behind the Binnacle
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Phil Kling
bill pittore
ken magida
On Jun 1, 2025, at 21:11, bill pittore <bill.p...@gmail.com> wrote:
Hi Ken,
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