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Old 04-06-2016, 05:09 PM   #21
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Thank you everyone. I found the problem. I locate a bad fuse. It was buried under the wires where I could not see it at first.

Thank you
Henry
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Old 04-06-2016, 07:40 PM   #22
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Wow! Problem found closure post! Good job.
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Old 04-06-2016, 07:47 PM   #23
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Greetings,
Not so fast....Why did the fuse blow? Hahahaha....
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Old 04-06-2016, 07:55 PM   #24
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Originally Posted by hfmckevitt View Post
Thank you everyone. I found the problem. I locate a bad fuse. It was buried under the wires where I could not see it at first.

Thank you
Henry
It's good to see your story had a positive ending.
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Old 04-06-2016, 07:57 PM   #25
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Greetings,
Not so fast....Why did the fuse blow? Hahahaha....
Sometimes they get old and they just die.
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Old 04-06-2016, 07:57 PM   #26
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Greetings,
Not so fast....Why did the fuse blow? Hahahaha....
Something grounded out?
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Old 04-06-2016, 08:11 PM   #27
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Or the fuse just retired. Jack pot!
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Old 04-06-2016, 08:34 PM   #28
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AWWW....You guys are no fun...
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Old 04-08-2016, 02:30 PM   #29
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Sometimes they get old and they just die.
That would be pretty rare. Even more rare considering that it apparently failed while the boat was idle.

It might remain a mystery as to why the fuse failed but it would be a good idea to have a spare on hand just in case there actually is a reason.
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Old 04-08-2016, 02:48 PM   #30
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So how common are blown fuses without a Paul Harvey moment showing up?
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Old 04-08-2016, 05:02 PM   #31
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So how common are blown fuses without a Paul Harvey moment showing up?
My master fuse is now 31 years old. The backup is now 17 years old.
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Old 04-08-2016, 06:28 PM   #32
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We would expect a master fuse to only blow if there's a fault in the cable from the batteries to the 12 volt DC panel. All the branch circuits have their own circuit protection and the fuse and cable should be sized to run everything at once.


Bow thrusters and possibly windlasses would normally have their own circuits and protection and not operate off the 12 volt DC panel.
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Old 04-08-2016, 07:12 PM   #33
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I could not locate the size of the fuse that went bad, so I used a 30amp. How could I have found the correct size. The old one was unreadable.

Henry
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Old 04-08-2016, 07:56 PM   #34
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I could not locate the size of the fuse that went bad, so I used a 30amp. How could I have found the correct size. The old one was unreadable.

Henry
You have to calculate the total load on the line.

You can get a idea of the possible total load by the size of the wires going to and from the fuse holder.
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Old 04-08-2016, 08:42 PM   #35
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You have to calculate the total load on it.
My thinking... main line fuses are sized to protect the wire size from batty to distribution panel from overloading... sized for ampacity of conductors.

Branch circuit breakers / fuses should be sized for individual circuit loads.
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Old 04-14-2016, 09:37 AM   #36
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I could not locate the size of the fuse that went bad, so I used a 30amp. How could I have found the correct size. The old one was unreadable.

Henry
30 amp is way to small if we are talking about the feed from the batteries to the DC panel. Looking at the cable size and then looking this up online would tell you the proper fuse size.


Another indication would be the rating of the DC panel's main circuit breaker. If there's a difference, use the smaller fuse size.
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