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High voltage over 3500 rpms
A problem I experienced last season -
When running around 3500 rpms or higher, my garmin fishfinder (160 red) would flash a message stating the voltage was too high and within a few seconds would shut itself off. It is the only electroninc equipment I have onboard so I don't have anything else to compare it to. My volt meter would be reading around 18 volts in these situations. Is this a problem? If so, how do I diagnose and fix it. It's almost warm enough here to start working on the boat. I have a 1988 Mercury / Mariner 150. Thanks for the help
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1978 V-20 Steplift 1988 Mercury 150HP 
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#3
03-12-2009, 11:57 AM
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No regulator, but good chance of a bad rectifier if I recall. The only parts of that charging system are the rectifier, stator, and battery.
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Airslot Airslot's V-20 Gallery
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#6
03-12-2009, 06:53 PM
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Take a picture of the powerhead so we can see what charging system you have. I believe that in 88 it could be a 9 or 16 amp system. The 9 amp was unregulated and would charge REALLY high once the batteries got charged. The 16 amp system has a regulator on it for most years.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#7
03-12-2009, 07:58 PM
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I experience the high voltage also but I dont lose any electroincs. Mine goes up to 16 volts when fully charged and there is no regulator.
My question is, is it possible to install a regulator, or has anybody installed one on this type of charging system. If so what kind of results did you get.
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1984 V-20 Center Console 1985 90 hp Merc. American by birth, Southern by the grace of GOD. Never let your hobby become a job but rather let you job become your hobby. http://www.wellcraftv20.com/gallery/turbine_doc_84_cc
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#8
03-12-2009, 08:11 PM
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It's possible to add a regulator, but it is easier to run 2 batteries and turn on a couple of lights to keep the charge down.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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#9
03-12-2009, 08:20 PM
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Quote:
Maybe I can talk my wife into a 200watt stereo system for the boat by telling her it is to keep the batteries from over charging. 
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1984 V-20 Center Console 1985 90 hp Merc. American by birth, Southern by the grace of GOD. Never let your hobby become a job but rather let you job become your hobby. http://www.wellcraftv20.com/gallery/turbine_doc_84_cc
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#10
03-12-2009, 08:23 PM
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I just dropped a line to CDI tech support to see what they have to say about a regulator for this type charging system. I'll let you know what they say.
Probably " turn on some lights and install a second battery" 
__________________
1984 V-20 Center Console 1985 90 hp Merc. American by birth, Southern by the grace of GOD. Never let your hobby become a job but rather let you job become your hobby. http://www.wellcraftv20.com/gallery/turbine_doc_84_cc
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