i have a 120 amp alternator it was powering it fine til it wasnt lol. but i also have a tiny battery in my car i know i need to buy another battery to put in the trunk but im more lost on what amp alt to get, ive been reading for hours and never a clear answer varying from full on blow ur month pay on a 1 of a kind alt **** yeaa!! to just see what happens with a new stock one. id rather not buy one and regret it after 2 weeks and spend more money on a new one so looking for some advice to prevent me from making a mistake.