Why fuse the line when the amp itself has a fuse?

[drpeeb 10+ year member]

Anybody know?

(Yes, I know this is a noob question, and many will feel like saying "because just do it dumb@ss", and they will, but I would like to know the reason)

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[JimJ 5,000+ posts]

You should put a fuse anywhere that the power wire has a chance of becoming grounded with the body of the vehicle. If the power wire somehow chafes with the firewall, you have a bad situation on your hands //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif An underhood fuse prevents this.

 

[Cabin_Pressure 10+ year member]

Inline fuse is to limit the current applied to the power cable.

 

[gotparts90 10+ year member]

fuse close to the batt so in case the wire grounds out it will protect the wire. you don't need one if you have good insurance. i pay just liability so I need one. lots of comp cars do not use them but I have seen to many electrical panels burn up and am terrified of electrical fires.

 

[jdawg 5,000+ posts]

the fuse in the amp to protect the amp against things like low impedance, the fuse in the wire is there incase the wire comes unattached and shorts against ground ie. you have no fuse it will keep spraking until it melts something, catches fire, or welds itself to metal and your battery blows up

 

[Proximity 10+ year member]

You're protecting the wire/car.

 

[drpeeb 10+ year member]

You should put a fuse anywhere that the power wire has a chance of becoming grounded with the body of the vehicle. If the power wire somehow chafes with the firewall, you have a bad situation on your hands //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif An underhood fuse prevents this.

Thank you! Makes perfect sense.

Edit ... tks for all these.