Correct fuse question

Art Bernard

Art Bernard

Banned
Joined
May 4, 2011
Messages
333
Hi all, does anyone know off hand what the correct size of fuse is for-nav lights, horn, bildge pump, and a radio are? This is a small bay boat, nothing special or heavy duty. All the wiring is good to go, but all the fuses were missing so i put a new fuse block in and I really want to get this right (fire at sea is bad juju). Thx Much.


Art
 
Y

yonu

Petty Officer 2nd Class
Joined
Nov 8, 2009
Messages
126
Re: Correct fuse question

ok from a automotive standpoint i would go with 10amps for nav lights 20amps for horn not sure on bildge pump but most fuel pumps are 20 amps and 2amp for radio if it is just a basic headunit

yonu

Edit ok guess I was wrong but like I said based I it on a automotive standpoint
 
M

Moody Blue

Captain
Joined
May 24, 2004
Messages
3,136
Re: Correct fuse question

What nav lights do you have? Single bow light and stern light? If so, I would fuse at no more than 5A.

Horn would be a wild guess without knowing the type of horn. Look on the horn for a current rating and choose a fuse a few amps higher.

Bilge pump should have a decal on it stating the current draw. Choose a fuse rating a few amps higher. Mine is fused at 7A.

2A-3A for the radio is a good guess.

The fuse is there to protect the circuit against short circuits and fires. Over rating fuses is dangerous.
 
Art Bernard

Art Bernard

Banned
Joined
May 4, 2011
Messages
333
Re: Correct fuse question

Bow is a single red/green mount, stern is single removeable mount. The horn is one of those dual carhorn set-ups (hehe, boat is a 77 viking and the horn sounds like a 77 Ford LTD). No sticker on bildge pump, but it is a 500gph pump. I appreciate the info.

Art
 
Silvertip

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,762
Re: Correct fuse question

7.5 amps on the bilge pump and 5 amps is plenty for the nav lights.
 
B

beagleboy

Seaman
Joined
Apr 15, 2011
Messages
66
Re: Correct fuse question

Rule of thumb 10% higher for the fuse then what is required. Note of caution re your horns, they may need a relay depending what they are particularly if your using automotive horns.
 
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