Xref: utzoo rec.boats:4162 sci.electronics:13052
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!mailrus!uflorida!travis!billr
From: billr@SSD.HARRIS.COM ( Bill Rominger/Cust Sup.)
Newsgroups: rec.boats,sci.electronics
Subject: Re: Battery-charger tap from outboard motor
Keywords: no regulation
Message-ID: <479@travis.csd.harris.com>
Date: 24 Jul 90 16:05:22 GMT
References: <1990Jul24.153632.27480@phri.nyu.edu>
Sender: news@travis.csd.harris.com
Reply-To: billr@misg.CSD.HARRIS.COM ( Bill Rominger/Cust Sup.)
Followup-To: rec.boats
Organization: Harris Computer Systems, Fort Lauderdale, FL
Lines: 28

In article <1990Jul24.153632.27480@phri.nyu.edu> roy@alanine.phri.nyu.edu (Roy Smith) writes:
A boat I'm looking at comes with a 5-HP Mariner outboard that has an
electrical output jack that is supposed to supply about 5A for recharging a
>12V battery.  The current owner says he tried to use it once but ended up
>blowing out some of his electronics because the voltage output goes all over
>the place.
If the mariner motor is a Yamaha manufactured, (it probably is) the 
Yamaha cat. lists "voltage regulator" Used to stabilize voltage output
of lighting coil. Stops blown bulbs bla bla. For manual models only.
Also lists: Lighting coil; Adds both lighting and charging capabilities
to 4 and 5 hp models. Accessory rectifier required for battery charging.
Educated guess: the output is unrectified sine wave from your output
coils.  Voltage will vary with rpm.  Get a 10a bridge rectifier and
feed the two motor output leads into the ac input.  Take the plus and minus
outputs and connect to a standard auto battery, or a garden tractor 12
volt battery. Measure the voltage at the battery terminals and check
for an increase with the motor revving.  
This configuration uses the 12 volt battery as a regulater.  It is the
same circut as used on a Johnson 1973 115hp outboard.  It works.  You can
get the bridge from Radio Shack.
good luck, and let me know how it works.

===========================================================================
Warning: This product is intended for use as an intellectual exercise.  Any
deliberate concentration and ingestion of its contents may cause blindness
or insanity.      Bill Rominger, Wilton Manors, Florida, USA, The Earth
          "Eat snook, live longer, release snook, fish longer"  DoD#136
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