1998 K1500 Power Mirrors

[Classic1965]

Hi, I was recently working on repairing my power mirrors and after some diagnosis I found they weren't getting power to the switch. I found there was power to the connection before the switch. I then cut wires and gave power to the switch. Everything worked until the switch smoked and now it will only power the mirrors down. After this I noticed I cut out a resistor board/voltage regulator of some sort. Where would I find a replacement for the resistor part that goes before the switch.