The 3 month old battery was dead this morning after trying to start. Plugs glow, just not enough juice to start. I have noticed recently upon start up, the battery light fades on during normal idle speeds until I give it some "gas" pedal to speed up idle - then the light fades out. Is this an alternator issue? The alternator seems to put out 12v. I am stumped. Recent addition of an aftermarket stereo...noticed the light fade in and out sometime following the install. Related?

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paul300td