Amp Wiring...Fuses HELP

[devildriver421]

So I'm doing going to be running 2 amps in my car...an alpine mrp-m1000 and a mrp-f300. The 1000 needs a 100a fuse, the 300 needs a 50a fuse. Traditionally I would mount the fuse as close to the battery as possible. I was planning on running a 2awg cable to a power distribution box near the amps, then running a 4awg to the 1000 and a 8awg to the 300. My question is, would I be able to just put the fuses after the distribution box?

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[subzero 5,000+ posts]

NO

put a fues 150 rating about a foot from battery terminals and another about a foot from before the distroblock.

 

[devildriver421]

Why can't I do that? And a 150 fuse would let 150 through before stopping power aka my amps would be fried.

 

[LinkedXJ 10+ year member]

aka his amps would be fried.

 

[VWBobby 10+ year member]

The ideal setup would be a 150 amp fuse within 1 foot of a battery, and seperate fuses like you were saying. A 100 amp for the M1000 and the 50 amp for the other amp. That way if you get a short in your main line, it'll burn the 150 amp fuse..... if you get a short in one of your amps or lines to your amps, it'll trip the smaller fuses after the distro block.

 

[misfit138 5,000+ posts]

Why not use a fused distro block?

 

[devildriver421]

I already had a non-fused.

VWBobby - Thanks

 

[x1le 10+ year member]

fusing the power wire a foot from the battery isn't to save your amps. it's to save your car from burning to the ground.

 

[The HACKER 10+ year member]

So I'm doing going to be running 2 amps in my car...an alpine mrp-m1000 and a mrp-f300. The 1000 needs a 100a fuse, the 300 needs a 50a fuse. Traditionally I would mount the fuse as close to the battery as possible. I was planning on running a 2awg cable to a power distribution box near the amps, then running a 4awg to the 1000 and a 8awg to the 300. My question is, would I be able to just put the fuses after the distribution box?

The fuses are meant to protect the wire. to stop shorts and electrical fires. The fuse from batt to distro is.....you guessed it to protect that wire. The fuses after the distro....from distro to amp is....you guessed it ALSO to protect that wire. The fuses on your amp are to....you guessed it to protect those amps.

 

[devildriver421]

Ok thanks...one other question. Where would I ground from? Just the amps themselves still right?

 

[VWBobby 10+ year member]

It depends. The cleanest install will have grounds running directly to the battery and have the battery ground isolated from the car's ground. That way you don't have any ground loops causing a hum or feedback condition. Most of the time guys just ground them to the body with some 0-4 gauge power cable, same with the battery. In most installs, it won't cause a significant problem.