im using a jl 1000/1 amp and w7 12inch sub is it okay if i use the factory batteries? i know yellow top optimadrive is recommended...and is it okay if i use a 4guage when 0 guage is recommended? ur advice would help thanks

 

The factory battery should be fine.

With 4AWG wire, I'd keep the length as short as possible. At full load (100 amps), you could have as much as an 8% voltage drop with 20 feet of cable. Reducing that to 10 feet would reduce the loss to 4%. With 0AWG, you'll see 1-3% loss depending on length.

However, you're unlikely to pull 100 amps for an extended period of time, if at all. So, actual loss will be lower.

 

4 gauge as stated is fine. Only thing I can add as running a full wire run from the battery's negative to the amplifier ground rather than a wire grounded from the amp to the chassis. Reason for this is that current follow the path of least resistance. A direct connection to the battery is best as opposed to the chassis since there are paint and other metals which may not be as good of a conductor as the direct battery to amp via wire. Make sure you are using copper wire, not something like aluminum.

 

thx u guys help so much i was gonna go with 0gauge but i bought 4guage at car toys for $100 that was very stupid of me i couldnt wait thats why but ill buy a 0guage wire eventually..CAR TOYS IS A RIP OFF!!!! sorry for any of u who works there

 

Ouch, that is a rip off. Check into the Kicker PKD4 (4 gauge kit) on eBay, it's roughly $60. The PKD1 is about $100 on eBay, and that's the 1/0 kit. Good luck with the install!