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Message: <blockquote data-quote="jt4x4" data-source="post: 8703749" data-attributes="member: 677386">4.6L v6 or v8? Either way, that should have enough torque at idle to turn the alternator. If you own or know anyone with an OBD II scanner with live monitoring, you could monitor engine load when it's happening. That would tell you if it's really that bogged down or if you have mechanical issues. Since you aren't blowing fuses, that tells you you've added less than 80 amps of draw.For reference, my off road vehicle's idle barely drops when I use my 12k winch that pulls up to 400 amps, and that's with a 130 amp alternator.</blockquote>

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