If you only want turn and not stop/park, the mirror signals lamps should tap into the front left and right turn signals (LT BLU and DK BLU), and not the left and right rear signals (YEL and DK GRN), as the rears' are tied into the brake signal in the Multifunction Switch.
For the 96+, late model, GMT400 (and probably the 88-95 years as well), the most accessible place to tap into inside the cabin would be in the IP harness between the Steering Column Connector C266, and the Bulkhead Firewall Connector.
For the 96+, late model, GMT400 (and probably the 88-95 years as well), the most accessible place to tap into inside the cabin would be in the IP harness between the Steering Column Connector C266, and the Bulkhead Firewall Connector.
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