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Help with an odd alarm/electrical issue woiuld be appreciated.

  • Thread starter Thread starter dave1985
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dave1985

Active member
Joined
Sep 5, 2007
Messages
53
Status
  1. OWNER - I own a Hatteras Yacht
Hatteras Model
36' CONVERTIBLE-Series II (1983 - 1987)
Have an 85 36C with gas 454 Crusaders. During the summer, I noticed the port tach would move all the way right when the key was shut off and stayed there after restarting though a tap on the glass would send it back to normal. Everything else fine.

Two weeks ago, I changed the oil in both before winterizing. No leaks, everything looked fine. A few days later, I moved it from one side of the marina to the other to the winter slip. Again no issues.

Three days later I get a call from the marina manager saying I had an alarm on the flybridge. He couldn't find out where it was coming from but could silence it by turning down the instrument dimmer. When I got there to winterize the engines I found the same thing but it seemed to be able to be controlled by turning the instrument light switch on and off so I left it off.

Turned on both engines to warm for winterizing and none of the gauges on either side worked. Both tachs were reading 700 or so and the other instruments were all at "0". Let them run for a few moments, plenty of exhaust water. Turned them off then turned the starboard one on to run the antifreeze through. Gauges are just fine again. Shut it off from the engine room. The alarm came on as it should and went off when I removed the key. Turned on the port engine and pumped the antifreeze through. Alarm from the flybridge is sounding while the engines running. (can't remember if the gauges were reading right) Finished the winterizing, removed the port key and the alarm stayed on. (though it didn't seem to be as loud as the oil pressure alarm normally is) Turned down the dimmer to silence the alarm. Shut off the flybridge main breaker and called it a season.

Anybody have a though where to start? Is it possibly something from the engine senders or an I definitely going to be crawling around under the instrument panel? Would there be a separate alarm linked to the instruments?

Thanks in advance for any help.
 
before I started looking for something exotic, I would clean all the electrical terminals to the gauges, sending units, key switches, and batteries. both the positive and negative side. pull off the connectors use some sand paper, or wire brush until bare metal is seen. reassemble with a die electric grease. once the connections are solid you can trouble shoot if needed. that is where I would start.
 
Keep in mind 90% of DC electrical problems are ground related
 

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