wiring is way too small to pump high amperage through..
I have seen those that have tried to upgrade the Festiva alt with stock 90 amp alts make fires and burn up the dash. Upgrading the Festiva alt is just too dangerous.
BTW, I'm not a youngin, (over 40) and while some of that may be true in that article, it mostly looks like an explanation on why to buy their product. And to say the reason people buy 1 wire alts is because they must not be smart enough to figure out how to wire a 3 wire alt. BAH!!
1. I don't need a dummy light, My caps have meters in them and if it stops charging, I will know and with the industrial dry cells that are meant to be discharged, it hurts nothing. If it starts over charging, I can simply turn the car off and disconnect the wire from the batteries without even exiting the car.
2. I don't need stringent remote sensing. This is a 2nd alt on a separate circuit. So as long as it senses when the batteries drop below a certain voltage and starts charging, and turns off when the batteries are charged, that's all I want.
3. The alt charging wire is a 1/0 and being in a Festiva it is shorter than almost any other car.
4. The alt is on it own pulley and if it tosses a belt the dry cells will drain and at most they would have to be recharged to 9v before the 1 wire would start charging again.
I have used both 1 wire and 3 wire alts over the years and yes the 3 wire is better for for general single alt car apps. But my charging system was designed to charge the batteries not, run the equipment.
I can run my whole system without the engine on for about 4 hours without dropping voltage enough to require a charge. So, unless I am on a long trip, or hitting it hard (which I then can't be in the car or I'd go deaf) charging is not a problem. I also have a 50amp 120v battery charger in the back of the car if I need more engine off time..
Needless to say the 160a alt and 2 industrial dry cells are overkill for the amount of things that 1 or 2 people can do at one time. All the while my tiny 50a Festiva alt runs the car and it's normal electrics just as it did before the system went in.