Alt + to batt + starting issue

[SQBubble 10+ year member]

So I did the big 3 , at first i only did batt to ground and ground to engine block and tried this for a week and it was running good. Then i went ahead and added 0 gauge from alt to batt and the car wouldnt start without revving it while starting... and at idles the rpm goes unconfortably low, shaking the whole car... as soon as i took the 0gauge off it went back to normal starting..

Im just curious to know whats happening? Is this an early symptom of a weak alt? Belt need to be changed? Is it prioritizibg the 0gauge wire when i put it and all the other components/engine arent getting enough juice ?

Thx for any insight

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[Boomin_tahoe 5,000+ posts]

What vehicle?

 

[SQBubble 10+ year member]

Toyota matrix 2010