Strange fuses

[Pro Build]

Where do you get fuses that look like this for replacement?

 

[Noko]

Just a guess, but they could be regular automotive fuses inside a black protective cover. Can you pull a fuse and see if maybe that black casing is just a cover? That first pic looks like the fuse box cover and its telling you what that fuse position controls. You can see one position is dock lights, another is tower lights.

 

[Neutron]

Look like a breaker block not fuses, looking in my manual but cant find anything on it

 

[Julian]

Pretty sure they are standard fuses with a fancy top. I blew one and wondered the same thing. Was at the dealer that day and they just gave me a few of them for free. If you look closely they show the amperage on them if I recall.

 

[marcham]

Looks like relays to me, not fuses. Have you looked up a parts diagram?

 

[Noko]

Looks like relays to me, not fuses. Have you looked up a parts diagram?

Most of the boat electrical systems are on a fused based system, not relay. A relay is typically a time delayed switch based on voltage.
If everything is hooked up right on a AR240 2013, thats my boat, it all comes on once you turn on the battery switch.

 

[Julian]

Looks like relays to me, not fuses. Have you looked up a parts diagram?

Actually depending on the box, they are relays and/or fuses.

 

[Pro Build]

Pretty sure they are standard fuses with a fancy top. I blew one and wondered the same thing. Was at the dealer that day and they just gave me a few of them for free. If you look closely they show the amperage on them if I recall.

The lettering and numbers on them do not make sense something like 1.2 K and other things, if you blow the picture up you can see themarkings. I'm not with the boat so I can't look for myself.,

 

[marcham]

When I saw 1.2k to me that means impedance, thus my assumption that it's a relay. I'm probably wrong though, cause my wife tells me so fairly often....

Where in the boat is the box located?

Doesn't look like the fuse box in the manual.

 

[Pro Build]

In the storage compartment that separates the cooler area from the engine compartment

 

[Dixie Highway]

If they are two prong they aren’t relays. My suggestion would be to pull one, turn the batteries on, and use a multimeter to check voltage to each side. If one side is 13v and one isn’t, it’s likely a fuse. That same multimeter can then be used to check the two prongs of said device for continuity and impedance. A cheap multimeter from Harbor Freight should accomplish this. $10, and it’ll save you miles of headache chasing electrical issues down the road.

 

[Pro Build]

They must be pretty reliable and durable if no one on this site has ever had to replace them.

 

[Julian]

Where do you get fuses that look like this for replacement?

Pretty sure I have the mystery solved.....they are resistors.

 

[Pro Build]

Cool, so it's not something I need to be worried about under normal circumstances. Thank you.

 

[gwrace1]

You typically see very little impedance through a relay. It's either on or off and is an electrical switch. Resistors will have a color code that tells you their impedance.

 

[tek4fun]

Julian is correct. They are resistors. The 120 Ohm ones are termination resistors for the CAN/NMEA communications and the 1.2 k Ohm are for the lights.

 

[marcham]

Mistery solved!

 

[PortTobacco II]

Pretty sure I have the mystery solved.....they are resistors.

View attachment 113149

So are these resistors meant to blow if I did something stupid when charging my batteries? (I debated if I should start another post but decided to jump on this one) My stupid story: Over the last month batteries went dead in my boat while on the lift. Just bought batteries 10/2020. I bought Duralast Jump Starter and hooked up battery to try to get the boat to turn over. At one put during my attempts I switched the POS and NEG with the Jump Starter and battery. The boat horn beeped and (being stupid) I tried cranking the engine anyways. At that point I pulled both batteries and brought they to AutoZone where they charged them fully. Put the batteries back into boat and I get NOTHING when I turn the keys. I am hoping at this point these resistors saved me from stupidity? I see that the green 20amp fuses where blown. I switched the 20's but still nothing. My thought is maybe the black ones are blown but I am having trouble finding them. Based on what I did, is this fuse/resistor box the first place to start when trouble shooting or should I be looking elsewhere? Any insight would be appreciated.

 

[EricE]

From an electrical perspective, resistors are not a protective componant like a fuse is. A fuse is meant to protect a circuit from an over amperage situation. A resistor is meant to change the amount of current a.ong other things. Like when an led light needs 3v instead of 12v, a resistor is used to lower the voltage for the led.

Over current for a resistor usually means melting, and a burned electrical smell. You can check to see if they are ruined using a voltmeter as someone mentioned. You set it to impedence and connect the voltmeter to both ends.. It should match the number on the resistor.

Hopefully, you just missed a fuse somewhere and you get it sorted out!

 

[Julian]

So are these resistors meant to blow if I did something stupid when charging my batteries? (I debated if I should start another post but decided to jump on this one) My stupid story: Over the last month batteries went dead in my boat while on the lift. Just bought batteries 10/2020. I bought Duralast Jump Starter and hooked up battery to try to get the boat to turn over. At one put during my attempts I switched the POS and NEG with the Jump Starter and battery. The boat horn beeped and (being stupid) I tried cranking the engine anyways. At that point I pulled both batteries and brought they to AutoZone where they charged them fully. Put the batteries back into boat and I get NOTHING when I turn the keys. I am hoping at this point these resistors saved me from stupidity? I see that the green 20amp fuses where blown. I switched the 20's but still nothing. My thought is maybe the black ones are blown but I am having trouble finding them. Based on what I did, is this fuse/resistor box the first place to start when trouble shooting or should I be looking elsewhere? Any insight would be appreciated.

In my boat, there are fuses by the battery...that is where I would start, fuses on the ECU in the engine compartment, and fuses in the starboard side under the seat. This is something would be good for someone to make a quick video of....