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That's great, but it won't tell you anything on your charging problem. The voltage at the coil is reduced through the ballast. On the regulator it should be system voltage. Check it on the ignition lead of the reg, and it will tell you what is going on. 8)

Factory style regulator? Is it the flat one for the 70 up cars, or the cube one for 69 down? If it charges at a steady 15 volts(doesn't go up to 17 or something if you rev it up) then it probably has a voltage drop to the ignition lead on the regulator. It then thinks the system voltage...