big two???

[Beatin' 10+ year member]

I was reading something on crutchfield about the vehicles electrical system and one person in the comments section asked about the big three. Then a "Buck Pomerantz" from crutchfield said this....

Andrew, I believe that most of the benefits of performing "The Big Three" come from just augmenting the two ground wires you mentioned - battery negative-to-car chassis and engine block-to-car chassis. I would be very careful with the alternator-to-battery wire. The circuitry in the alternator includes diodes and current-limiters that you don't want cooked.

wtf is going on? Do you not need to upgrade the alt wire?

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[rebelfromva 10+ year member]

Alt pos to batt pos. batt neg to alt case. Alt case to engine block or frame.

 

[cdc351jeferson 10+ year member]

Alt pos to batt pos. batt neg to alt case. Alt case to engine block or frame.

alt case to engine block? its already bolted to the motor

OP do alt positive to batt positive(install fuse on this wire or 300amps for 0 guage). bat neg to chasis. and motor to chasis.

 

[Falcons 5,000+ posts]

alt case to engine block? its already bolted to the motor
OP do alt positive to batt positive(install fuse on this wire or 300amps for 0 guage). bat neg to chasis. and motor to chasis.

this

 

[rebelfromva 10+ year member]

Block to chassis I guess. My stock batt is in trunk and only have the big two. Batt ground and batt pos done.

 

[Beatin' 10+ year member]

So is the guy right or wrong with what he said? He makes it sound like alt pos to batt pos upgrade isn't really needed.

Maybe for non-competitive systems?

 

[trumpet 5,000+ posts]

I was reading something on crutchfield about the vehicles electrical system and one person in the comments section asked about the big three. Then a "Buck Pomerantz" from crutchfield said this....


wtf is going on? Do you not need to upgrade the alt wire?

With the factory alternator it's more important to upgrade the ground side. Watch this video' date=' skip to a bit after 2 minutes in to where Matt starts talking about engine grounds and such.