In-line fuse size

[Big D 13]

My car was wired for a 750W amp, and it has a 80A in-line fuse. Now I want to use a powered sub with built in amp (nominal 350W) that calls for a 20A fuse. Should I swap out the old 80A fuse for a 20A fuse? Or add a 20A fuse somewhere along the line? Any guidance will be much appreciated.

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[n2audio 5,000+ posts]

The fuse is for the wire, so 80's still ok (assuming it's at least 4-5 Awg), although changing it out for a 20-30A fuse would be providing better protection.

 

[Mooncatt]

I'd also recommend swapping it out just to keep things consistent. I wouldn't toss the 80A fuse, though, just in case you decide to upgrade again later, not to mention having a spare on hand.

 

[Big D 13]

I'd also recommend swapping it out just to keep things consistent. I wouldn't toss the 80A fuse, though, just in case you decide to upgrade again later, not to mention having a spare on hand.

Thanks!

 

[Big D 13]

The fuse is for the wire, so 80's still ok (assuming it's at least 4-5 Awg), although changing it out for a 20-30A fuse would be providing better protection.

Thanks 

I'd also recommend swapping it out just to keep things consistent. I wouldn't toss the 80A fuse, though, just in case you decide to upgrade again later, not to mention having a spare on hand.

Thanks