Thanks for your help DaleM, after doing more searching and reading on the net.Low speed (red)wire was already hooked up..So, it's the way it should be. so can mark this as solved

just curious tho, what are the blue and yellow wires that are not connected for???

Okay thanks....so the red wire controls the high and low speed of the blower for heating..it's already hooked up to the blower relay..just seems awful loud for low coming out of the supply vents .must be me

Hi guy,s I have a Coleman EB12B electric furnace #wol615630, 39,000 BTU's, No AC and No heat pump .I just wanted to know how to lower the speed of the blower. The blower is 4 speed and it has red, blue,black and yellow wires..The Red and the black are hooked up, the blue (med-high) is not and the ye...