The big 3

[taylor3333 10+ year member]

What size with should i use under my hood?

im only gona have a 3600 watt amp with about 1800rms. im gona use 4 gauge to run back the the amp.

so what size wire should i use with my big 3 upgrade?

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[The HACKER 10+ year member]

Just using 0 or bigger would be good. alt to battery, ground to frame, ground to engine.