Heater Blower Switch

[cfalson]

I have a question, I replaced my heater switch and now have a high speed fan and missing the two slow speeds. I checked the dropping resistor and it seems there is no voltage on the common, any ideas?
Thanks,
charlief
66 Coupe

 

[magicv8]

Does the car have A-C?

 

[cfalson]

Does the car have A-C?

Yes, the car has A/C, blower is ok on high speed, droping resistor is good.

 

[magicv8]

Check the fuse and fuse holder at the A-C relay under the hood. You should have 12volts there.

The other possibility is the coupe fan terminal on the switch you replaced. If you put the single connector on it instead of the correct spade lug, you get the problem that you have.

 

[cfalson]

Replaced switch, fuse was replaced, relay does not have power, I think I have a wiring problem. Will troubleshoot wiring this spring, voltage going to switch and out, no power at blower at the low speeds, the only thing I can not figure out why does high speed work if relay does not get power.
Thanks

 

[magicv8]

That's the way A-C cars are wired.

Run a 12volt line from the battery/starter/hornrelay to the 30amp fuse if you want 3 blower speeds and higher fan on recirc.