1996 GMC Safari frount blower

Hi, yellow wire from hvac to resistor assembly is low speed. Next speed is tan wire. Next, lite blue. Take connector loose from resistor assembly, check that you have voltage, use testlite, the appropriate wire for appropriate speed. The orange wire is for high speed, there is a relay for high speed, the orange wire is voltage to coil side of relay, Once the relay is energized, you only have continuity for high speed, red wire is voltage for load side of relay.