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Hour gauges

Discussion of radars, GPS, autopilots, stereos and TV's. Also iPad and other mobile navigation devices.
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Carverlvr2
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Vessel Info: 2004 Carver 366, VP 8.1’s
1992 Carver 33, Crusader 7.4’s
1979 Searay Sundancer 260
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Re: Hour gauges

Postby Carverlvr2 » October 16th, 2025, 11:34 am

My 2004 366 has similar issue. LCD on each gauge is nearly identical while the ecm’s show a 60 hr difference.
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bud37
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Re: Hour gauges

Postby bud37 » October 16th, 2025, 1:01 pm

If I remember right the ECU data was actual engine running time and could be broken down further to idle hours and hours above certain rpm thresholds ....at least the mefi 4 we had was that way.
FWIW.....The above is just my opinion.
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paulr
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Re: Hour gauges

Postby paulr » October 19th, 2025, 6:02 pm

Every boat I had the hour meters advanced from ignition pulses. Not from 12 volts only.
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km1125
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Re: Hour gauges

Postby km1125 » October 20th, 2025, 8:58 pm

paulr wrote:Source of the post Every boat I had the hour meters advanced from ignition pulses. Not from 12 volts only.

On my '83, the hour meter just ran on 12V fed from the port ignition switch.

I turned the port key on one time to check the fuel tanks but forgot to turn it off and found it the next day... about 14 hrs later and there were 14 more hours on the "clock".
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paulr
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Re: Hour gauges

Postby paulr » October 29th, 2025, 5:47 pm

Well, if you wanted to syncronize it just diconnect it for 14 hours.
My boat is a 2001 but it had new 8.1 Crusaders engines installed in 2008. The dashboard instrument read 800 something but the ECM's read around 510.
Are there any modern day tach/hour meters that would syncronize with the ECM?
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