Question about wire size and lights dimming

[Xjeff 10+ year member]

Hello I'm still currently trying to solve my car lights / dash dimming. I plan on buying a new battery when I get my taxes. But my current wire is "0gauge" I don't remember what brand it is but not a brand that's common for wire. But I was thinking maybe my lights dim from trying draw too much power through a small wire? I believe my power wire is about 15 feet long and has a 100a fuse on it, I'm running about 1700rms total. I was thinking wouldn't that wire be pulling alot more than 100a if its really 0 gauge? But I know almost nothing about how the current flows through wire so any help could help me cross this off the list of probabilities. So I know fuses can take more than the rated amps for short period of times, but anyone ran about 1700rms on a 100a fused wire more than 15 feet long? Also my wire does seem a lil small for 0 gauge but then again I've never seen a true 0 gauge vs fake 0 gauge wire in person. The wire came with no strand count so I have no idea how many it has. If you think the wire in a little small I was thinking about buying 25 feet of knu 0 gauge to replace the power/ground and also the big three. So any help would be very helpful.

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[MK5 Fahrenheit 10+ year member]

If you don't have the big three yet, that should be the first thing to upgrade because the factory alternator wires are not meant for upgrading your car system, so i would first get the big three upgrade

 

[Xjeff 10+ year member]

I do currently have it with the same wire as my power to amp

 

[Tenacious]

0 gauge should be rated for 250A if CCA and 300A if OFC

 

[Xjeff 10+ year member]

Ok yeah, but shouldn't I pulling a max of like 185amps (well over the 100a fuse) when my amp draws for bass hit. 1500rms can draw up to 188amps in short bursts but 4 gauge can only handle say 125 at 15 feet which wouldn't pop my 100a fuse as easy. I got some 4 gauge stinger wire that ill compare to my "0 gauge" and see what they look like. 0 gauge should be almost but not quite twice as much copper yeah?