Update: (and request for help!)

I replaced the AC pressure switch. Problem still exists.

So, when this all started, I attempted to change the blower speed, which popped/broke something. That is when everything stopped. This is when the fuse hold was melted. I'm not sure if the blue #8 fuse actually blew or not, but what else could have been taken out in the process?

Like I said earlier, if I jump the terminals for the aux and blower motors where the relay plugs in, both motors DO work. The compressor WILL engage.

I also tried to "revert" the wiring back to factory, and nothing worked. No aux fan, no blower motor, and no compressor engage.

I'm scratching my head here so hard it hurts!

Thanks!

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'85 300D 190K miles
running on B100 Biodiesel since 156K, SCRATCH THAT! I can only find Biodiesel at 1 location in Houston! (not very convenient)