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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Outboard alternators care and feeding		  New Topic  Topic Locked
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seastream
Navigator

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USA
242 Posts
Initially Posted - 05/07/2005 :  09:21:10  Show Profile  Visit seastream's Homepage
Is it harmful to an outboards' alternator to run the engine without a load (battery) connected? My 1987 'Rude 9.9 Yachtwin has electric start & alternator, but also has a pull start. I or someone else (boatyard) could conceivably start the engine without a battery, which is why I'm asking.

Bob
Seastream
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 05/07/2005 :  10:40:48  Show Profile  Visit Leon Sisson's Homepage
I doubt it would hurt. About the only risk I can think of would be if you had the alternator connected to electrical equipment, but no battery. Then there might be a chance of it putting out enough voltage to damage light bulbs, for instance. If running an outboard alternator without a load were likely to damage anything, we'd have heard a lot more about it by now!

-- Leon Sisson
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 05/08/2005 :  08:23:16  Show Profile  Visit Frank Hopper's Homepage
No one ever puts a load on them when they bench/test run them. They just yank the rope and run them. I run mine every spring in my driveway.
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frog0911
Master Marine Consultant

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USA
1349 Posts
Response Posted - 05/08/2005 :  12:14:16  Show Profile
Just make sure you tape the ends of the wires coming form the alternator so there is no direct contact without a load between them. Alternators do like ot feed on its on generated power.
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 05/10/2005 :  07:58:30  Show Profile  Visit Arlyn Stewart's Homepage
I'm not sure if all are the same...but on the Honda, hookup to a battery is necessary to get any output, which means that inadvertantly touching the disconnected wires together would have no effect and they won't run lighting, etc. without a battery in the circuit.
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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.