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The power draw of the LEDs is negligible, esp. since they're just replacements and not add ons. Like Troy said HIDs draw less power than halogens (except on startup). Is this "guy" a mechanic? Did he offer you a really good deal on replacing an alternator? Flat out you don't need one. Most of the people who have big systems just replace their batteries and have no problems.... honestly I think the only person I've seen who did replace theirs was jeba, and he did stereo competition.