I'm having 2 JL 15s and about a 10 year old slash 1000 watt amp installed in a 16 Hyundai accent the alternator only puts out 90 amps stock and still stock battery when I talked to the JL dealer they said I would be fine with 4 gauge wire and it will be fine off the stock alternator/battery alone I know they are the professionals but still a little nervous I might end up replacing the alternator or burning up the wire