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If you have B+ at the fan motor and a good ground then that means the blower motor is no good.
I'm having a problem with my heater, it work right up to a couple days ago it just stop. I'm getting power to the relay but the wire that's coming from the relay to the blower motor it has no power. Changed the relay twice, ran a jump wire from the battery straight to the B/M and fan works. I'm stumped ! 1980 chevy C10 Stepside -350-T350 A/T with A/C