lalojamesliz

hey guys, i bought a mechman alt for my car that is a 6 phase and puts out a max of 171 amps around a month ago or less. i relocated the battery to the rear cargo area (hatchback) i have done "the big 3" done to my car and have a 1 awg cable going from my battery (+) to the alt and a 2 awg mechman cable going from the (-) of the battery to the casing of my alternator along with another 1 awg cable grounding it also inn the engine bay. my question is, when i start my car the voltage starts at 14.2V and once i drive around a little while the voltage drops to 13.6 at idle with nothing on or with everything on (radio,lights,car,ac fan) is this voltage normal? my car idles at 1k rpm i have a redtop optima with a resting voltage of 12.6V (after 2 days of sitting) and its a larger one. i think 800 or 1000 cca.

why cant it be grounded to the chassis?