GM Radio Power Adapter 1978-1984 Email 4-Wire GM Radio Power Supply Adapter Part #: 2543F Part #: 2543F Quantity Price ea. 1 + $9.66 4 + $8.21 15 + $6.76 Sale Price! 8.21 Back to: GM Interior Connectors Ask a question about this product Dimmer Switch Connector Pigtail 1960-1976 GM Radio Front Speaker Adapter 1978-1984 Description 4-Wire GM Radio Power Supply Adapter. From 1978 thru 1985. Replaces GM #12102601, #88860448 and AC-Delco #PT287 or #PT1893.