Hi I am having problems with my charging system. I have a GM 100 amp 1 wire alternator. Wire harness is a kwik wire kit . On start up it charges at 14 volts when everything warms up after a while the voltage drops to 12 volts.when everything is cool voltage is back up. I am not running any heavy current draws only ignition ( GM HEI ) Electric cooling fan Derale, gauge cluster VDO ,brake lights and radio . The alternator is grounded to the block. I have the battery in the trunk and grounded to the frame. Positive cable goes directly to starter where it connects to alternator wire. the pulley on the alt is aluminum and has straight blades. Could the blades being straight cause the alt to overheat by not moving enough air ? Any suggestions on how to solve this issue will be greatly appreciated.