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Message: <blockquote data-quote="JerZeyStangz" data-source="post: 1394275" data-attributes="member: 8031">I was doing a little research and I found out the stock alternator puts out 110amps, and at idle with underdrive pulleys put out around 75 amps which is insufficient. Stock pulleys with stock charging system puts out about 85 amps which is sufficient. In order to run this mod with no sacrifice in power at idle you can upgrade the alternator and battery. I am going to upgrade to a stronger battery and see what my results are...I am the type of guy that likes my "cake and eat it too" type solutions. One thing I can conclude is that underdrive pulleys definitely exploit the weaknesses in my charging system. If I didn't have a weak battery to begin I don't think I would be finding solutions. I would just say screw it and live with the slightly dim lights at night but I can't stand that. 130a alternator + 1000 cranking amp Battery = success. Right now my setup is: 110a stock alternator + 800 cranking amp Battery = insufficient for charging at idle great for regular driving. Last resort solution is bumping the idle up 100rpms because I notice it charges a lot better at the blip of the throttle. I know this is a big investment into the charging system for our cars but upgrades are always better since our cars are almost 20-25 years old now.</blockquote>