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Before throwing money at it, are you sure it's the alternator?
Honda uses something called an Electronic Load Detector (ELD) to vary the alternator output. If this is acting up, you could see symptoms similar to a bad alternator. It's especially noticeable if you have a stereo or added some auxiliary fog lights that are not sensed by the ELD (it's located in the main fuse box). With a large current draw that is not detected by the ELD, the alternator may not be driven hard enough to balance out your power consumption.
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