thank you for clearing that up as i was always curious causing me to babble on about it in this thread .... i do have progress though thanx to Arthur ... put negative to the blue wire on the blower and sure enough high speed came on and scared the crap out of me .... b4 that let it run in high and low setting then this feels 100 times faster .... now i believe i have to narrow it down between blower motor regulator and push button unit with i believe testing voltage behind brake booster