Just some more input to help you out - a friend of mine lost his alternator pushing about 900w from a Kenwood KAC-9105d. I can't say it was directly from the strain of the amplifier, but he had no problems prior. I'm running the same amp and have had no problems yet, let's hope it stays that way. My best advice is to google 'Big 3 upgrade' and run 1/0 under your hood. That will allow 100% of your alternator/battery's output to go to your car, providing less strain on both your vehicle's electrical system and your amplifier.