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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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  #1  
Old 04-06-2010
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Polarity Reversed...?

I just bought a 1981 Bristol 32 and on the way home noticed that the polarity reversed light came on the electrical panel when trying to use shore power. It will not allow anything to run on shore power as is. I follwed the wire from the plug connector to the panel and it appeared that it was connected properly. The battery power system works fine but no shore power.

Any ideas or things I can try? Could it be the polarity sensor is bad?

Thanks,

Jeff
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Old 04-06-2010
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Did you use a polarity tester and a 30-amp-to-15-amp pigtail to check the post directly??




Without doing this, you don't know if the problem is your boat's wiring or the dock's.
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Old 04-06-2010
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We tried two different shore power cords at two different marinas and had the same problem. Makes me thing the problem is somewhere in the boat.
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Old 04-06-2010
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Quote:
Originally Posted by MobjackB32 View Post
We tried two different shore power cords at two different marinas and had the same problem. Makes me thing the problem is somewhere in the boat.
Jeff:

DON'T PLAY WITH THIS....GET COMPETENT HELP. Reversed hot and neutral on a boat....especially a new-to-you boat which you aren't familiar with.....can KILL YOU!

It sure sounds like someone has reversed the polarity onboard, but you won't know until the AC wiring system has been checked out by a knowledgeable boat electrician. It's well worth the cost for an hour of a professional's time.

There must be dozens of such professionals in Virginia Beach. One whom I know could help you is Don Waldecker 757-463-1561 or 757-641-3026 cell.

BTW, congratulations on the new boat. Bristol 32's are very nice!

Bill

Last edited by btrayfors; 04-06-2010 at 03:04 PM.
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Second what Bill has said... It seems unlikely that you'd have two bad shore power cords and two bad power posts at two different marinas.
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Old 04-06-2010
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Bill,

Do you know anyone up in mathews county? The boat stays there.

New batteries were installed last year. Could that have anything to do with it in any way?

Also the ground and Neutral bus appear to be wired to each other.

Thanks.
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Batteries shouldn't have anything to do with it, if they were properly installed... but you never know what a previous owner has done to the boat's electrical system. Unless you're familiar with boat electrical systems, hire someone competent to go over it and tell you what is going on with it.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Old 04-06-2010
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Ground and neutral should not be connected on a boat, the exception being internally on an AC generator or an invertor. I'd second getting an expert to look at it before trying to use shorepower.
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I think you are mixing terms here and some others seem to be confused - the light typically found on most nav station electrical panels does not indicate reverse polarity but rather glows when there is a potential difference between ground and neutral and is indicative of a grounding problem, not reverse polarity.

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Old 04-06-2010
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From Blue Seas AC panel installation instructions:
Attached Thumbnails
Polarity Reversed...?-1.jpg   Polarity Reversed...?-2.jpg   Polarity Reversed...?-3.jpg  
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