:4-dontknow:
i
seem to see that the 1987 - 1991 Ram Van wiring schematics, may be the same
Back then, they still printed repair manuals, like Chilton, Haynes, & Motor manual
They could be purchased both in a 1" thick manual or the 2" manual, they are low cost, especially at auto swap meets
If you have a Library Card handy, it doesn't cost a dime
https://www.youtube.com/watch?v=8pJ1KiT2SDc