[Rhodes22-list] Yamaha Outboard is overcharging battery

[Mary Lou Troy]

I will add that when we installed the switch, we ran the idea by 
Yamaha (I forget if it was by the local tech or via email) and they 
said it would be OK. At the time we installed it, we heard from some 
folks who know a lot about outboards that running the motor with the 
switch in the off position would fry the diodes in the charging 
circuit. It was a risk we were willing to take and so far no 
problems. The outboard still charges the battery (we have a Link 10 
monitor and can see the results) and as Fred says our AGM is still 
keeping a good charge. Most of our charging is from shore power but 
the outboard charging is more important to us than it used to be 
because the Yamaha is electric start. We only have the one battery 
though when cruising, we do take along a jumper pack which gives us 
miscellaneous additional charging possibilities and also can serve as 
an emergency starter battery.

Mary Lou
1991 R22 Fretless
Rock hall, MD


At 09:27 AM 7/17/2011, you wrote:
>Our Yamaha 8 also sometimes puts out more voltage (>15 volts) then
>needed to keep the battery charged.  I solved the problem by putting
>an on/off switch in line and disconnecting the battery from the motor
>when the motor is running.  I also sometimes just turn on cabin lights
>when motoring they draw enough current to lower the charge rate to
>under 14 volts that seems to help.  Both the motor and AGM battery are
>over three years old and seem to be in good shape.
>
>Fred Kaiser
>91 Rhodes 22 Fretless
>Rock Hall MD
>
>On Sat, Jul 16, 2011 at 10:49 PM, AndrewCom <acomas at verizon.net> wrote:
> >
> > My Yamaha T9.9 outboard is overcharging my battery (it reads 16.24 Volts at
> > the battery).  I changed the Rectifier Regulator (part number
> > 6G8-81960-00-00) but it made no difference.  Is there some other part that
> > limits the output voltage or did I get a bad part from Yamaha?
> > Any thoughts?
> > Thanks
> > Andrew
> > --
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> >
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