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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
It's from 90 D150 3.9L Manual Trans. It is located under the dash on the driver's side. The wire colors are: Blue white, Yellow red, White green and Brown red.