Originally Posted by the727kid
The Big 3 aren't batteries. Doing the big 3 involes upgrading your power and ground to 0 guage.
it requires all 0 guage wire
1. from alternator positive to battery positive
2. from battery negative to frame
3. from frame to engine block
Can I get an Amen?!? This should be done by everyone with an aftermarket system, regardless of size. For all you go fast types, #3 can actually add HP, by giving your sensors a better ground reference. For best results though, I'd probably suggest several 4ga or 8 ga wires, going from different parts of the engine to the frame. Just make sure every connection is good.
Sure, 0 Ga might be overkill for some systems, but a) your not using much, so it won't cost that much more than smaller wire and b) this way, you only do it once, instead of doing it with 4 ga for your 500 watt system, just to have to redo it down the road when you go to 1000 watts.
Toby