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My LTD will do the same thing. I attribute the drop to the draw of the amplifier/auto volume thingy. As long as your voltage is staying up in the ranges listed, you should never have a problem with the battery. Adding more stuff to the origional charging system is where a lot of problems come from. Have you checked your stator and regulator plugs for discoloration and signs of heat. Check out this link http://www.goldwingfacts.com/forums/view_topic.php?id=48624&forum_id=9&jump_to=486304#p486304
There is also the option of the poboy alt conversion.
My LTD will do the same thing. I attribute the drop to the draw of the amplifier/auto volume thingy. As long as your voltage is staying up in the ranges listed, you should never have a problem with the battery. Adding more stuff to the origional charging system is where a lot of problems come from. Have you checked your stator and regulator plugs for discoloration and signs of heat. Check out this link http://www.goldwingfacts.com/forums/view_topic.php?id=48624&forum_id=9&jump_to=486304#p486304
There is also the option of the poboy alt conversion.