Fuse size

[AJM511 10+ year member]

I have an mb quart 4.125 amp for my subs, and it has 3 35 amp fuses on it. What size fuze do i need for the inline fuse next to my battery?

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[i2ain2thunder 10+ year member]

120A should be fine. You want to be able to give the amp all the power it can draw, 120a will help protect it from getting some kinda surge. But really you fuse the power wire by the battery to prevent the wire from being damaged not the amp. Ideally you fuse to kinda protect both things So I'd go with 120A.

 

[AJM511 10+ year member]

alright. I have a 40A fuse in there right now! haha. How would that affect my system if i ran that daily? Would it just not draw enough power?

 

[i2ain2thunder 10+ year member]

If you're amp ever tries to draw more then 40amps it will blow that fuse, which based off the 3x35amp fuses it holds it should be more then capable of drawing more then 40amps at points, depends on the wire. You should probally be running at least 4gauge in order to not starve that amp of the power it needs. Most amps don't really have a problem with too little power, ur just not gonna get you're max potential out of it.

 

[AJM511 10+ year member]

If you're amp ever tries to draw more then 40amps it will blow that fuse, which based off the 3x35amp fuses it holds it should be more then capable of drawing more then 40amps at points, depends on the wire. You should probally be running at least 4gauge in order to not starve that amp of the power it needs. Most amps don't really have a problem with too little power, ur just not gonna get you're max potential out of it.

Ya I've got it all 4-gauged out. It sees 14.5 volts with my truck running, so I dont think it's being starved power //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif. Will switching that fuse make a noticeable difference? I guess that's the question i meant to ask.

 

[i2ain2thunder 10+ year member]

Probally not. The fuse is just meant to protect things from getting too much power. They don't decrease the power at all they just break if they get more power passing through then they are designed to handle.

 

[daboyfrumdabx 10+ year member]

Probally not. The fuse is just meant to protect things from getting too much power. They don't decrease the power at all they just break if they get more power passing through then they are designed to handle.

This. You'll be fine. In fact, I'd probably keep the 40A in there until you experience issues with it. Most fuses will allow significantly more power through than they're designed to for certain lengths of time. So if you had a 120A fuse there, you could easily allow 200A of current through for a short bit.

 

[Kangaroux 5,000+ posts]

yeah no point in changing it if it hasn't blown yet. if it does blow in the near future just get a 60A or a 80A fuse

 

[AJM511 10+ year member]

Alright thanks guys.

 

[Phoenix Risen 10+ year member]

you can actually run quite a bit more power through a fuse than it says it will take.

just look at what a lot of meca people run.

there is a guy running in s1 that has 1800 clamped watts on a 30 amp fuse.

granted its only playing for 30sec but still.

 

[DeathByWaffle 10+ year member]

With my mtx thunder 6500d mono. It has 3 x 25 watt fuses. I use a 4 gauge wire to the battery with a 80 watt single fuse on it.

Speaking of experience I blew all my fuses on the song called no hands haha. I think I maxed my amp good 12'' L7's do the trick