(Amp Install Q) Fusing my Battery

I've got 4gauge wire running from my soundstream to the battery. when i fuse it at the battery, what rating amp do i use? i know 4g will stand up like 150amps. I was talking to tech-support at Crutchfield and they said whatever fuse rating that's on my amplifier, (there are [3] 80amp fuses), that's the rating fuse i need at the battery... really!?

EDIT: sh*t my bad, there are [3] 25amp fuses on my amp.

there is some debate in this:

Some say the fuse should be equal to the maximum current the wire can carry

Others say the fuse shold be the same as the amp's fuses.

I use the first method, or less, so i would use 150A assuming it's not a real long run of wire

there is some debate in this:

Some say the fuse should be equal to the maximum current the wire can carry

Others say the fuse shold be the same as the amp's fuses.

I use the first method, or less, so i would use 150A assuming it's not a real long run of wire

no, not too long, i'm guess-timating about 15ft at most, even that might be too much. from the trunk to the hood, civic sedan.

thanks for clearing that up. the amp kit i'm buying has a 80amp AGU fuse, but it looks cheap, generic. i dunno, i hear AGU fuses can be of poor quality sometimes. maybe a 150amp ANL would be better?

there is some debate in this:

Some say the fuse should be equal to the maximum current the wire can carry

Others say the fuse shold be the same as the amp's fuses.

I use the first method, or less, so i would use 150A assuming it's not a real long run of wire

the third method (the correct one) is that you are protecting the BATTERY from a short circuit, so you should never exceed the battreries current capacity.

the third method (the correct one) is that you are protecting the BATTERY from a short circuit, so you should never exceed the battreries current capacity.

haha, thnx for clearing that up

the third method (the correct one) is that you are protecting the BATTERY from a short circuit, so you should never exceed the battreries current capacity.

arn't batteries capable of 300-550A depending on model?

that would be a MAX current rating ...... the avg or "RMS" current rating is actually roughly equal to it's reserve rating in minutes - don't ask me how they worked that out.

There is a manual you can order online that explains everything you ever need to know about impedence, power, amperage, etc., etc. Do a search for Mobile Electronics Certification Program. I'm about to start the course so I can get a part time job installing at a local shop.

yup, MECP. i need to start a class for that too.

I have the MECP manual around here somewhere .... it had a number of mistakes in it (theory wise). I hope the newer ones are a little better.