What Size Fuse

4 ga to battery to distro block

4 ga to sub amp

8ga to speaker amp

really short run, battery in trunk.

 
the absolute most I would use on 4ga is 125 amp for lengths of 10-20'. Under 10' you're prolly okay @ 150 amp.

If your batt is in the trunk (where its easy to switch) I would suggest upgrading to 2ga. Think of it as having head room for you current draw.

 
The inline fuse to battery is gonna get 150 amps

What size fuse for the distro block for the 8ga wire? Distro block came with 80 amp fuse.

 
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