Fuses, I need a clear answer

[Black Truck 10 10+ year member]

I will have a extra battery in my toolbox, and my main under my hood. I will have a 250 amp alt. Amps are 2 sundown audio 1000d's strapped and a 100.4. I am running 1/0 from my main battery to my rear battery, then 1/0 from my rear battery to my amps via a distrobution block in the cab.

I believe I will need 3 fuses. 2 on the wire from the first to rear battery and 1 aft the rear battery. All of these within 12 inches. I was going to use 250amp fuses. Is this correct?

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[x2o 10+ year member]

That is correct, but I'd recommend 300A fuses as you should fuse for the wire, not your load.

 

[Rashaddd 5,000+ posts]

That is correct, but I'd recommend 300A fuses as you should fuse for the wire, not your load.

there is nothing wrong with fusing lower however

 

[boomzilla 10+ year member]

300 amp like x2o said. those fuses prtect the power wires themselves, not your amp.

 

[x2o 10+ year member]

there is nothing wrong with fusing lower however

Yes, that's apparent but if he CAN he should go 300A.

It's not 100% important, but if you upgrade to an amp with a higher current draw in the future you won't need to change out fuses again.

 

[helotaxi 5,000+ posts]

Fuses are cheap. Probably won't blow the 250A. If those aren't blowing, no reason to go bigger.