heater blower problem

New to the forum. 2008 Tacoma heater blower stopped working on high. It had not been working on the lower speeds for some time. Replaced heater resistor with square plug connector, replaced heater blower, rebuilt harness connector to blower since it had over heated. Replaced 50a heater fuse in engine compartment. Also replaced heater relay in engine compartment. Checked all the various 10a fuses related to the AC/Heat. Any ideas from the community. Oh and the blower stopped working within days after I had the alternator fail and replaced.

Thanks,
Hawktrip

2008 Tacoma
326,000 miles strong

 

Common for the blower switch to burn and also the IA4 connector (Pin 8 Black Yellow) behind the driver's kick panel is common to have a burnt pin.
Grab you a test light and see what's missing.
https://www.tacomaworld.com/threads/2nd-gen-information-diagnostics.784008/#post-28042158

 

Jeez, you already went through most of the answers.
Possible problem in the control switch for the blower? Maybe a spilled soft drink got it some time ago?

Not as classy as @Dm93 , but I had it happen in a yota previa.