What is the big 3?

this may be a dumb question but i see people say it all the time, anyone wanna fill me in?
The same guy that called me a *****...geesh.

Anyway

Big 3 - Add wires for:

Batter Pos+ to Alternator +

Battery Ground- to Chassis

Engine block to Chassis (Alternator usually grounds to the engine block)

Use 1/0 gauge. Don't remove the current wires, just add on.

 
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