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Re: Hour gauges
Posted: October 16th, 2025, 11:34 am
by Carverlvr2
My 2004 366 has similar issue. LCD on each gauge is nearly identical while the ecm’s show a 60 hr difference.
Re: Hour gauges
Posted: October 16th, 2025, 1:01 pm
by bud37
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.
Re: Hour gauges
Posted: October 19th, 2025, 6:02 pm
by paulr
Every boat I had the hour meters advanced from ignition pulses. Not from 12 volts only.
Re: Hour gauges
Posted: October 20th, 2025, 8:58 pm
by km1125
paulr wrote:QR_BBPOST 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".
Re: Hour gauges
Posted: October 29th, 2025, 5:47 pm
by paulr
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?