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<blockquote data-quote="66novals3" data-source="post: 8554162" data-attributes="member: 672504">The circuits are about as easy as it comes. One terminal on alt is hot at all times. The exciter circuit has 12v applied to the circuit when cranking or ignition on, it then goes through a 470 ohm resistor that is paralleled with the charge indicator light and straight to the regulator. So, you&#039;re telling me that if I had two identical alternators both WITH internal regulators, turning at the same rpm, they should both output the same amperage? These alternators have different ratio pulleys...how ford designed it. This is how they work currently. The smaller pulley alternator fires first. The other puts out a very minimal charge at idle. You get to about 2000 rpm and the small pulley alternator shuts down. The secondary sees this and goes full tilt. I do have pulleys coming to test them being identical. To me, nothing is perfect and I&#039;d bet one fires first and the regulator of the other sees it is not needed, it doesn&#039;t turn on. I hope I am wrong for sanity sake. Right now, I have a dead lower alternator, it does have a warranty but I&#039;m still wondering what options to take. Would you attempt to make the 2 alt set up work on the main system or isolate the second alt for audio only or upgrade to one large quality alternator? Using the current set-up is obvioussly the cheapest....if it works. The isolation set-up would cost me an additional battery+cables ~$350 and the single alternator set-up after returning everything &amp;amp;buying new would be an extra ~$50.</blockquote>

[QUOTE="66novals3, post: 8554162, member: 672504"] The circuits are about as easy as it comes. One terminal on alt is hot at all times. The exciter circuit has 12v applied to the circuit when cranking or ignition on, it then goes through a 470 ohm resistor that is paralleled with the charge indicator light and straight to the regulator. So, you're telling me that if I had two identical alternators both WITH internal regulators, turning at the same rpm, they should both output the same amperage? These alternators have different ratio pulleys...how ford designed it. This is how they work currently. The smaller pulley alternator fires first. The other puts out a very minimal charge at idle. You get to about 2000 rpm and the small pulley alternator shuts down. The secondary sees this and goes full tilt. I do have pulleys coming to test them being identical. To me, nothing is perfect and I'd bet one fires first and the regulator of the other sees it is not needed, it doesn't turn on. I hope I am wrong for sanity sake. Right now, I have a dead lower alternator, it does have a warranty but I'm still wondering what options to take. Would you attempt to make the 2 alt set up work on the main system or isolate the second alt for audio only or upgrade to one large quality alternator? Using the current set-up is obvious sly the cheapest....if it works. The isolation set-up would cost me an additional battery+cables ~$350 and the single alternator set-up after returning everything &buying new would be an extra ~$50. [/QUOTE]

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