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Like all aspects of your car, your electrical system can be exponentially upgraded. Perhaps you have a work truck for on site welding, generators, etc. or you have a crazy sound system that requires extra amps - you will need to upgrade your alternator.
So, a regular car alternator provides between 60-90 amps while a high powered alternator will support over 200 amps for after market accessories. Choose wisely - assess what you really need (in terms of power) and then shop around. An alternator upgrade tip: although you may think the alternator is the only thing you need to worry about when you upgrade your system, you also have to upgrade your wiring so it can hold the juice.