My 74 has a Motorola alt system, the PO installed a electronic distributor and had the exciter wire running off the " I" terminal of the starter solenoid . The alternator will not charge until I jump from the hot + lead to the white wire then it will charge to 13-14 volts until I turn it off then restart, then no charge. from what I see on the wiring diagram the exciter wire is tied in to a continually 12volt source with the Key On Run position. The "I" terminal is only hot during the start cycle. which I think is not enough time to excite the alternator'? Am I reading the diagram correctly?