Jeez, just installed one on a '98 S-10. If you can't find one, make one. I make quite a few harnesses for plows that we install on older vehicles. If you can't find one, shoot me a PM and I'll email you a diagram
if you get the unimount wiring guide from western (click logo above), you can easily make one or just cut and modify your factory vehicle harness. Its quite easy.
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