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78 Starfire; You can try a temporary ground bypass from battery negative to the blower motor to see if your ground is open circuited.

Wiring diagrams here: viewtopic.php?f=19&t=22240

i had the same problem - it was the 3 pin connector under the dash. It's weird because the connector plugging into it only has one wire, - but that is the power wire

generally, if it works at some speeds and not another (like your High speed here) its a fried resistor in the resistor pack .. one of them has overheated and is fried.

http://www.samarins.com/glossary/blower ... istor.html

https://www.youtube.com/watch?v=hgar6Q1lV6A

http://www.youfixcars.com/blower-motor.html

https://www.youtube.com/watch?v=UJ-MfAo8AUQ

https://www.ericthecarguy.com/faq/solvi ... ms?start=7

https://www.cargurus.com/Cars/Discussio ... 2_ds569146

good luck, Sav

High speed fan operation doesn't use the resistor pack. The switch feeds power to the high speed relay and the relay puts straight battery power to the blower mtr.