REPRODUCTION. You are purchasing a 10DN to 10SI / 12SI alternator conversion wiring harness adapter. This user friendly plug-in part is designed to connect 1963-1974 GM external regulator wiring harnesses to 1969-1985 GM SI series (10SI or 12SI) internal regulator alternators, thus allowing use of an internal regulator alternator in place of an external regulator alternator. The image shown is a representation of the actual product, you will receive the correct part as ordered.
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