What size fuse do I need?

[powerstroker 10+ year member]

What amp in-line fuse will I need? I will be running a Crossfire XP600D@1 ohm with welding lead as my power wire that is about the size of 4 gauge. The vehicle is a Ford F-250 diesel. The amp does not have an external fuse. Any help is appreciated. Thanks, Jake.

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[basscort2009 5,000+ posts]

probly a 60 or 80 should be fine. think of it as every 10 watts u should use 1 ampere of fusing, 600 watts = 60 amps of fusing