How do i know what size fuse i need for a hitron hra 2500 amp?

Hello porter401,

I'm assuming that you are talking about the primary power fuse installed on the wire bringing current from the battery. Most amp manufacturers specify the value for the primary fuse, I don't know why Hitron didn't tell you that.

Here is a very good discussion about properly sizing the primary power fuse.

Going by the power output of your amp, and the amount of current it needs to draw, you'll need a fuse in the range of 30-40 amp. I'd start with a 30 and if the amp blows it frequently/more than once/ immediately on power up, then move up to the 40.

Hope this helps. If it does, please rate as "FixYa".

Im assuming you dont have the old one. typically it will be 20-50a. i recomend consulting the manufactures website.