How to install blower motor relays??

green72 said
I am confident that I am wiring the relays correctly. My car has a 3 speed fan, low comes on when the A/C or heat button is depressed med and high are controlled by the fan switch. I am seeing a low voltage at the med and high wires at the switch when it is in low position. Where is this coming from? Is it coming thru the resistors?

Post a diagram, even a photo of hand drawn, of how you wired these

Yes, there will be feedback on the unused speeds when not selected. If you wired it correctly, the unused speeds will be "opens" at relay contacts and won't go anywhere

Without seeing how you hooked this up, we are only guessing.