Thats what the photo-conductor cable do....alternator direct link to battery. Yes, need to jack up car.

Now the probable (he not sure able City, but sure abt gaga and myvi), the photo-conductor cable actually provides more negative than good after installation of his gc cabling.

The original cable from alternator goes first to ignition then to battery (at least thats my understanding from what he said). The PC cable bypass this and direct the alternator current straight to battery thus power charging the battery. The battery current also flow back to ignition (I can't remember)....however PC cable pulled way stronger current from the alternator due to the high quality cabling.

The original ones that goes to ignition (actually more important), got less of it. Whatever alternator produced, PC cable will get way higher split ratio than the original (as it split the current with higher ratio on its side), thus ignition might get less current. The flow back from battery might be stronger than the current coming into engine direct from alternator.....somehow that produced underpower effect on his gaga and myvi test kuah...

He not sure abt City effect on this issue tho....but that makes me feel not so nice abt my PC cable now. Without GC, PC cable has immediate power affect but with good gc setup, PC cable might be render less effective...possibly negative as current flow from both side to ignition might not be balance. It boost up the PC cable from low 7 reading to high 16 now...if alternator produce 70amp and split between all usage....not sure how it works now.