After upgrading the big 3, headlights still dim..

[KRN 10+ year member]

I just upgraded the big 3 today to 0 gauge wire for everything but my headlights still dim when my subs hit..I guess my next step would be to upgrade my alternator. How much power do I need from a higher output alternator. I've got one Alpine 600 watt amp pushing 2 10" Rockford Fosgate p3 shallow mount subs...and an 800 watt audiobahn intake amp for all my door speakers. All together 1400 watts..What size alternator?

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[stevew007 10+ year member]

did you clean all the grounds? bare metal? give us a run down on what you did

 

[daboyfrumdabx 10+ year member]

What kind of car and what size is the stock alt?

 

[KRN 10+ year member]

chevy silverado extended cab 2006...not sure what size the stock alternator is but I started with 0 gauge from the positive side of the battery to the alternator. 0 gauge from the negative side of the battery to a spot on the chassis that already had a ground on it from the engine but sanded before terminating. Ran another 0 gauge from the engine block to that same spot on the chassis, and then another 0 gauge from the same spot on the engine block to the negative side of the battery.

 

[stevew007 10+ year member]

Sounds like you might want to check the battery. Its not like you have a ton of power.