I'm about to do a "Big 3" upgrade, what gauge wiring should I use?

 

The bigger the better. Most use 0 gauge, but 2 gauge might suffice depending on how many amps you are pulling. Anything above 1200w and I'd suggest 0 guage.

 

If you have any wiring left over from your amp install, use that. I have a 2awg kit that I will be running, so I took a 1' length for my engine-chassis connection and a .5' from battery to chassis. After I install my new amp kit, I'll use the rest for the alternator-battery section, if I have enough.

Just remember to remove all the paint from the chassis mount points. Also use a fuse between your alternator and your battery, you don't want your battery blowing up!

 

Fusing the power is pointless unless you are fusing both ends. Either way fusing it is stupid because your just bottlenecking the new flow you created. Don't fuse or don't bother even doing it.

 

a question along this line is what if the stock battry/chasis is 8awg would 4awg replacement be worth while doing? (i have no 2awg left from my power wire) and if that's not enough would two runs of the 4awg be better than one?

 

Smooth, the more cable the better. A 8awg + 4 awg will be a lot better, and even better still 4awg + 4awg. Have 4 runs if you think you need it, just remember that there is never too much.

 

cool, thanks. i thought the more is better would apply but just wanted to confirm.