There are some write ups on here about the big 3 upgrade. When I did mine, I used #2 welding lead. It is normal to use 1/0 wire. 1/0 wire is bigger than #2. So FYI, the big three is 1 big wire with a big fuse (125 to 150 amp) that goes from the Alternator positive side, back to the battery positive. Then 1 wire from the alt frame or case, to the negative battery post. From the neg bat to the frame, the big 5 I did was 2 more ground wires. 1 to the engine block, and 1 to the cab of the truck. Here are some pics of mine.I plan on using the harness I got off the truck to run the fans, and use my 0411 to control them. But I'll definitely look into the big 3, I believe dad and I may have done it already though over 6 years ago. Ill have to look and see.
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