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<blockquote data-quote="gckless" data-source="post: 7960731" data-attributes="member: 635756">Sounds like that may not be the best alternator. If you are noticing big headlight brightness change in only idle to 1500 engine RPM with your system off, then something is wrong. Your alternator/electrical system should be putting out almost the same voltage at idle as it does at RPM&#039;s. That&#039;s the point of a voltage regulator. Your new alt may not have been compatible with your stock regulator though. Take some voltage measurements of your system at a couple different points, like at your battery and at your amp, both at idle and at higher RPM&#039;s if possible, both with your system on and it off. Get a friend to help you, or this is where a voltage meter comes in handy. What alternator did you get? Where did it come from? What is your batteries resting voltage?Also, you are right at the line of capacity of 4ga. You should be ok, but make sure you have it fused, with no more than a 150A fuse. What amp are you running?</blockquote>

[QUOTE="gckless, post: 7960731, member: 635756"] Sounds like that may not be the best alternator. If you are noticing big headlight brightness change in only idle to 1500 engine RPM with your system off, then something is wrong. Your alternator/electrical system should be putting out almost the same voltage at idle as it does at RPM's. That's the point of a voltage regulator. Your new alt may not have been compatible with your stock regulator though. Take some voltage measurements of your system at a couple different points, like at your battery and at your amp, both at idle and at higher RPM's if possible, both with your system on and it off. Get a friend to help you, or this is where a voltage meter comes in handy. What alternator did you get? Where did it come from? What is your batteries resting voltage? Also, you are right at the line of capacity of 4ga. You should be ok, but make sure you have it fused, with no more than a 150A fuse. What amp are you running? [/QUOTE]

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