Fuse holder and fuse question

duckmaster1

Cadet
Joined
Feb 4, 2010
Messages
16
Ok,
I have a fuse holder on my jon boat, I think it goes to my running lights, not sure.
But when I was checking the fuse, it was broke inside of the holder. So I tried to get the bottom of the glass fuse out, and it is stuck in there, ruined my fuse holder, I can get a new one.
But the question is, the glass fuse says 40-250v on one end, what type fuse do I need, 30 amp, 20 amp, 10 amp. I am still trying to learn this stuff. The reason I ask, is I need to get a watertight fuse holder also, they come in 10, 20 ,30 amp , so if anyone could help, that would be great.
Thank You.

Here are some pics of the holder with wire, I think it is 10 gauge wire.
Thanks again for any help.
 

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NYBo

Admiral
Joined
Oct 23, 2008
Messages
7,107
Re: Fuse holder and fuse question

You're looking at the voltage rating, not the amperage. If all you have are the nav lights, a 10 amp fuse should be sufficient. But the harness in your pictures would be overkill for nav lights. What other electrical devices do you have on the boat?
 

duckmaster1

Cadet
Joined
Feb 4, 2010
Messages
16
Re: Fuse holder and fuse question

I think it is my plug in for a plug for a trolling motor, I just now looking at this, because it is set up for the extra battery.
So it would be for the front trolling motor. Does that make sense, I am new at this stuff.
Thanks for the help.
 

NYBo

Admiral
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Oct 23, 2008
Messages
7,107
Re: Fuse holder and fuse question

Depending on the power of the trolling motor, you may need a 40 or 50 amp fuse and appropriate fuse holder.
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,758
Re: Fuse holder and fuse question

If it is indeed for the trolling motor, scrap the fuse and install a 50A circuit breaker within one foot of the positive terminal on the battery. These are automatic reset devices so if it opens, all you need to do is wait a few minutes and it will reset.
 

NYBo

Admiral
Joined
Oct 23, 2008
Messages
7,107
Re: Fuse holder and fuse question

Yes, a circuit breaker is preferable to a fuse.
 

duckmaster1

Cadet
Joined
Feb 4, 2010
Messages
16
Re: Fuse holder and fuse question

But I have never ran a trolling motor on it, I knew that was what it was for, but right now I have a spotlight hooked up to work there. I have never intended to put a trolling motor on the front of my boat, so I took the plug, and hooked up a spotlight to it, but never ran the light on it yet.
 

NYBo

Admiral
Joined
Oct 23, 2008
Messages
7,107
Re: Fuse holder and fuse question

If that's all you'll have on the circuit, you won't need that large a breaker or fuse. What is the wattage of the light? Remember that watts/volts=amps. Go to the next size lager than your computation, and a circuit breaker is more desirable than a fuse.
 
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