Update: thanks to everyone's suggestions and input, disassembled and cleaned every connection I could, including the grounds, put it all back together and now the fan blows on all three speeds without warming the fuse...sweet...but what a pain, lol laugh2 up

1968 Plymouth GTX
1974 Dodge P/U Long Bed Stepside 318
2019 Ram 2500 6.4, auto, 4WD