NE1 ever upgrading wiring using a relay to the blower motor?

I'm just wondering if this is possible...I'm getting the A/C working in my wifes duster and when coming to a stop at a red light, or at idle...the blower motor comes to an almost stop as well I can see a big pull on the ammeter.

I've already re-done the headlight harness, but that doesnt solve my daytime driving issues when the voltage drops.

Is it possible to wire in a similar relay for the blower motor and run a dedicated large gauge wire to the motor itself?

I'm just trying to figure out how to do it and maintain a Low/Med/High speed setting.