Alternator?

[Becker 10+ year member]

I have a pretty interesting situation here. I drive a 2000 olds intrigue with 130,000 miles on it. I have 2 alpine type r 12's on 4 ohm on an MRX-M100, and also a 200 watt speaker amp. I used to be listening to music with the car at idle, and the subs would kill the car, but I discovered I had bad grounds. So, I fixed those and I haven't killed it since. I was just wondering if this was the reason for it dying, and if I should or need to get a new alt. Your thoughts and recommendations would be appreciated.

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