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 Run an outboard without a battery?		  New Topic  Topic Locked
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pfduffy
Captain

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USA
317 Posts
Initially Posted - 11/24/2012 :  17:57:02  Show Profile
Is it possible to run an outboard - specifically, a Tohatsu 9.8 electric start - without a battery? Will I do any damage to the charging system if I simply pull start my motor to do my winterizing.
Pat Duffy
1984 SK/SR #4113
Slàinte
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shnool
Former Capri-25 Tech Editor

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USA
1032 Posts
Response Posted - 11/24/2012 :  19:13:55  Show Profile  Visit shnool's Homepage
nope... just don't short the alternator, and you'll be fine. Actually it's good to pull start from time to time, just to keep the mech free.
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Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts
Response Posted - 11/24/2012 :  22:09:09  Show Profile
The problem occurs if you disconnect (or switch off) the battery while the motor is running. If it isn't attached (or is switched off) when you start the motor, no problem.
Edited by - Stinkpotter on 11/24/2012 22:10:23
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islander
Master Marine Consultant

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USA
4024 Posts
Response Posted - 11/25/2012 :  08:27:39  Show Profile
The battery charge circuit basically shuts off if the battery is removed. The regulator/rectifier senses that there isn't any resistance (battery) in the circuit and won't send power to the battery. Power output at the plug on your motor will be zero. Running the engine without the battery charge hooked up will not harm anything.
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awetmore
Master Marine Consultant

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USA
1144 Posts
Response Posted - 11/25/2012 :  08:30:33  Show Profile
Do it and enjoy the simplicity that it provides for the electrical system. Larger boats that only have electric start have much more complicated electrical systems with multiple battery banks on cascading charger systems. Since an outboard can be pull started pretty easily the C-25 gets away nicely with one battery and a much simpler (and less expensive) electrical setup.
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pfduffy
Captain

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USA
317 Posts
Response Posted - 11/26/2012 :  07:31:05  Show Profile
Thanks all - winterizing done.

Alex - I appreciated the simplicity of my little motor while I stood on the fuel dock and saw that gas purchased at a dock costs $4.35/gallon!!! Yikes!! I am so glad that I use anywhere from 4 - 6 gallons per season and I purchase it at the Wawa up the street for $1 less.
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shnool
Former Capri-25 Tech Editor

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USA
1032 Posts
Response Posted - 11/26/2012 :  08:05:39  Show Profile  Visit shnool's Homepage
$4.35/gallon would be cheap compared to our lake!

They were getting (at the height of the season) $7.25/gallon. Because there is a huge insurance cost to the owner of the pumps, and he's on regulated land, and the potential for "spills" large (floating docks only lake), they, rightfully, pass the premium on to the customers.

My little 2.2hp outboard with 1 liter fuel tank might look like a joke, but my 2 gallon jerry-can lasts me half the season (lots of short trips), and I can "import" the fuel (as a mix of course) from places where the fuel costs less. I just carry it in with my 6 pack cooler for day trips.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.