Have you ever taken a capacitor apart? If not you should It might help you understand how they are constructed, there is a insulator in between both electron storage devices, not a direct path to ground from one side to the other If there was a direct path to ground that would be a short, shunt, correct A capacitor will store electrons(voltage, milli amps and so on) when charged and discharge them to ground at the first opportunity(IE neon lights and capacitor start electric motors as well as other applications) I learned that lesson in high school auto shop the hard way by the instructor telling us not to touch them (one on each desk not charged) until intsructed to on what they are and what they do and that they can hurt you, get your attention , if not handled correctly. One of the upper classmen had charged several of them, mine included when the intsructor had went out of the classroom during class break EMF, electromotive interference can be induced into semi conductor circuits in many different ways, RMI, Radio Magnetic interference can be also. Both can and will adversely affect many low voltage circuits controlled by computers
The car battery, like all batterys, is a energy(voltage and amperage) storage device, the alternator takes direct current to operate it, it cannot generate electricity like a generator can, and amplifys it to a higher A.C. voltage and then converts it back down to direct current to charge the battery and provide all the current to run the circuit load the car has. If the alternator is to small to carry the operating load the battery will go dead eventually Hence the increase amperage output of todays alternators, the bigger the load the more current, energy, needed to operate it
One more time on direct current flow in cars, the current is taken, output, flows from the negative side of battery, NOT THE POSITIVE SIDE The only time D.C. elctrons flow from postive to negative is inside the battery, not outside The alternator charges into the positive side of the battery after all the other circuits are fed, our old Mopars route all the charging current from the alternator through the amp gauge and then back to the battery, not the opposite GM and Ford used parelel inductive circuits on there amp gauges, when provided
OP, follow the instructions from the manufacturer on your EFI installation They've already went through all the grief on reserach and development on thier new products and know what the customer needs to do during the installation to avoid problems on thier products Some people, mechanics and technician of all sorts, don't or won't read the installtion instructions until they run into problems, many times self induced I hope this helps some of you