Alternator Upgrade : Nippondenso 90/120/140/etc Amp

[geezer101]

Bigger is always better with batteries and alternators. You will find anything that has a higher current pull will work better (like full car audio systems running amplifiers, the starter motor or decent headlights and driving light combos). The system will only ever push it's peak voltage into the wiring harness and nothing more (13.8v-ish if it's being regulated properly) and the wiring is already gauged for it's respective application. It's when the system is under heavy load/current draw that things can go wrong (recently did an investigation into why my friends' Kia Cerato "potato" was blowing low beams - it pushes 14.45v through each individual light circuit, just bad design from day one...) Most Kias suffer from this issue...a voltage drop and better fuse system and the headlights would last a decade rather than a few months.