Terminal one with a internally regulated alternator. Diodes are a one way valve for electricity, be sure to install it correctly.
12SI Altenator upgrade problem
Did this upgrade 3 years ago on my 71 with no problems. Just did the same upgrade on the 72 Elco and it starts and runs fine, but the motor will not shut off with the key? I have an ignition switch for the MSD box, so I can kill it that way. I wired it correctly and looped the old regulator harness per MAD's web site instuctions.
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