Enlighten me plz

[Dr. Slam 10+ year member]

The technical reason for fusing is so your wire doesn't short out and burn your entire vehicle up. What more do you need to understand than that? //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Odvious guy is odvious...

That's what all fuses are for... And I never said I questioned this

 

[Mitch86 5,000+ posts]

I'm asking for enlighten for why this is so? You see what I'm saying? My alt is never going to produce more than 500 amps of current so this led me to this way of thinking

It has nothing to do with how much current you will be pulling through the wire! If you have two batteries connected together and the wire gets a cut or something and touches metal, its going to cause a fire

Having a fuse in line will help prevent this because the fuse will blow if that happens. You're complicating something that is so simple...lol

 

[SourDeez 10+ year member]

Can't tell if serious..

 

[Dr. Slam 10+ year member]

Lol if the wire gets cut, where I have ran then the wire, the that will be the least of my worries. Everything's grommeted and above the for I've the vehicle. Not to mention the transfer case, frame, ect... So the wires being cut are the least of my worries

 

[Mitch86 5,000+ posts]

Then don't fuse if you're so confident nothing bad will happen. I'll be the first to LOL in your "my vehicle burned to the ground" thread. //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[Dr. Slam 10+ year member]

I'm asking for an electrical math answer not a what if. The wires can't be cut unless a lot of other things are cut before them. Through the top or the bottom.

 

[Dr. Slam 10+ year member]

Then don't fuse if you're so confident nothing bad will happen. I'll be the first to LOL in your "my vehicle burned to the ground" thread. //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

Ok your right...

Now someone with an electrical background answer plz

 

[Mitch86 5,000+ posts]

Wtf..there is no math to this! If too much current is pulled through the wire, or if the wire is shorted, the fuse blows to prevent the wire from burning. Its really that simple. Fuse if you want to be safe, don't if you choose...

 

[Dr. Slam 10+ year member]

I'm not asking "if" the wire could be shorted. Im asking "if" there's a possibility that there could be too much current pull from the wires and if so why? Thats why the thread is entitled "Elighten me"

I know that's what the fuses prevent and I already have the fusing available.

 

[Dr. Slam 10+ year member]

What are you not understanding?

 

[Mitch86 5,000+ posts]

What are you not understanding?

I'm not understanding why you are arguing when I answered the question you asked. //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif You asked why you need to fuse if you're not pulling more current than your wire is rated at. The answer is to protect against shorts or the possibility of your amps drawing too much current. But I guess you need an electrical engineer to explain this to you...

 

[DaveVT 10+ year member]

There is no mathematical reason. There is no "technical" reason. It IS NOT NECESSARY!!!!. We do it for piece of mind IN CASE something happens. Say one of our batteries fails its possible it causes a short in which case it can pull ALL available current form the front cell which can be well over the amperage the wire is rated for. If this happens (not saying it will) the wire will get hot, melt and catch on fire. It is possible your vehicle will go with it. If you fuse you will prevent the wire from melting etc...

Your alternator is not putting that much power through it, your correct but its not for that reason. The ONE and ONLY reason to fuse is to protect yourself or car in case of a dead short. It will also serve as a second layer of protection to your equipment because a surge of power like that will most certainly smoke your stuff if its own fuses dont blow or there isnt any internal.

SOOOO is it necessary? Nope, but it is most certainly recommended.

Hope this helps ya //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[sexy 10+ year member]

This is so comical that I have to chime in and yes there is a mathematical answer to the question but not enough info was given to begin with so it will be hard to give a great answer. We could say if we knew what the potential of the batteries and alternator combined was what math proves but telling us 75 amp hours does not give us enough info.

So lets just pretend we know that you have two batteries that are able to deliver 800 amps each for ten minuets (1600 amps) now not even looking at alternator potential you have sixteen hundred amps that could be pulled for ten minuets. In the electrical world engineers figure things on potential and 1600 amps has the potential to fry all of your 0 gauge wires in a heartbeat. So the math answer you’re looking for is how much potential do I have and how much can my wires sustain. Potential has nothing to do with power used that’s a whole different question.

Does this help? POTENTAIL.

 

[NutHugger 10+ year member]

Heres the truth. If you get in a wreck, or if a wire gets pinched on a hot day when that grommet is nice and soft, the power wire will short to the body. It happens. You may think it can't, but you also don't know what a dead short is so you need to admit that you don't know everything right there and just say "it can happen".

When power and ground touch, your batterys terminals are shorted together. This means it has 0 or nearly 0 resistance between the two terminals. It will dump infinite current out at this point until it dies. You cannot shut a batter off like you can an alternator. For this reason we fuse, because while that battery is dumping everything it can into the wire, the wire has to drop all of the voltage. This causes it to become red hot. It will ignite carpet or anything it touches, or heat other metal it is touching so that IT ignites something flammable it is touching. If you were to get in a wreck, you'd want fuses so the car didn't ignite while you were trying to get out. Just because you went with small batts doesn't mean they can't dump a ton of current under a short. You want math? Look up the current ratings for your batts under a short. You'll see how high it is and understand your power wire can't handle it.

 

[duanebro 10+ year member]

kay

It is not your alt. If the wire shorts it will pull all you juice from the battery - turning it into heat and burning up your ride! (or at least ruining all your batteries.)