How to Choose an Alternator: Can High Output Alternators Cause Damage?

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How to Choose an Alternator: Can High Output Alternators Cause Damage?

The good news is that replacing a factory alternator with a high output alternator, in and of itself, isn’t going to damage the rest of the electronics in your car, even if the new alternator is much, much bigger than the old one.

As an example that trends closer to the ridiculous than the likely, let's say that you determine that your new sound system, plus the preexisting power requirements of your car, add up to well over 200A. For a safety net, you decide on a 300A alternator.

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Even if you manage to find a high amp alternator that’s capable of putting out a massive 300A while still somehow fitting in your engine compartment, that extra amperage will only be tapped if and when your equipment actually needs it. You can rest easy that the only downside to an alternator that's too big is that it's a waste of money, and it won't damage your electrical system.

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