Sold WTB Give me ideas on amps for FI BTL 18

4ga will not work. Use 0ga for your amp (might be able to do 2 runs of 4ga), along with a HO alt and a dry batt under the hood. Unless you are competing...which then spare the alt money for more batts.

 
ok here is my recommendation also what i am running. sudown saz3000d amp fi blt sub d2, 250 amp alt 1 powermaster d3100 in back and one powermaster d3400 in the front and knu wiring 0 guage throught out including big 3. a year ago i also was searching for an amp so i decided to go with the sundown cuz its bad *** little did i realize that the amp was just the begginng electrcal is where it really gets high dollar. if your willing to spend the money defenitley go with a 3000 watt amp but you will need all of this to really make that btl bumb

 
If you're going with a sundown amp then I would suggest 0 awg wire throughout and a h/o alt and you'd be fine. If you decide to go with something more current hungry then maybe thats a different story.

 
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