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Here is the best "read" you will find on the subject. MAD (Mark) is a hell of a source for electrical knowledge as it pertains to automotive needs. Just be ready to spend literally an hour or more on the phone if you manage to reach him!What’s the major difference between one Wire And normal?
As Terry said . One wire or external regulator , it will work either very good but if you have alter your lightning to halogen , putting in an electrical fan and so on , you just need a more powerful alternator.
I stayed with the external regulator but took an electronic one which regulate the voltage better.
You don't have to get a bazillion amp unit. Figure out what YOUR car needs and get something adequate. What does your electric fan pull when running? Don't worry about start-up draw that is misleading. How about your lights? Stereo? For everything except a car with a stupid powerful stereo set-up I think 100 amp is more than enough.So if I use exactly the same wire setup 3 wire, it’s hard d to find a 3 wire chrome (same physical specs)?? And should I get a 140-150amp?
Thank you everyone!! After reviewing the pros and cons I will go with a 100amp one wire. I let you guys know how it turns out.
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One last question. If I were to ever go to an EPAS steering system, would I need a bigger alternator then a 100amp?
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I have no idea what level of power an electric steering assist motor would draw. I'm sure that's a spec that the source can provide. Again, unless you have some really huge draw stuff in the car, 100 amps is fairly substantial.