Do fuses restrict?

[Da64u 10+ year member]

What's the point on getting such big wire if fuses are so tiny?

I have a fuse on my power wire near the battery, and I'm thinking of adding another amp after my distro block going to my 2400.1. Is that excessive?

Click to read more...

 

[mylows10 5,000+ posts]

It does restrict. But also protects the wire from power surges

 

[bbeljefe]

A properly sized fuse doesn't restrict anything enough to be a problem, because of their lack of resistance. If our alternators & batteries were within a few inches of our amps, we wouldn't need such large wire because wire length increases resistance and it is resistance that causes voltage drop. Since fuses are so short, they have very, very low resistance and that's why they don't cause the problems you might think they would. Likewise, that's why they aren't any larger than they are.

As for your question, it's not possible to answer without knowing what your existing electrical load is and what size your current wire is. Also, what size is the current fuse and is the power wire CCA or OFC? Lastly, what amp will you be adding?