Blower motor not coming on at all. Ran test light. I have power at red wire with light grounded at (-) battery. I have power at black wire with light grounded at (+) battery. No power at gray wire with light grounded at (-) battery. I ran these test with car running hvac set at 75 degrees and had someone adjust fan speed as I was testing. Then ran test with vehicle off and got the same results. Previous owner replaced blower motor. Ive checked all fuses and I know theres not relay for the blower just and air conditioning and heating programmer. Should I replace blower motor again? Or should I replace programmer or dash panel switch?