BlackMess Posted April 13, 2010 Report Share Posted April 13, 2010 So my mazda A/C request wire supplies 12v all the time and drops to .05v when depressed. I need to somehow wire a relay so when I press my A/C button I have a ground signal to send to the GM a/c request wire. 30- 12v 85- ground 86- mazda a/c request 87a- To GM request, I'm still seeing 12v at 87a when the a/c button is pressed. Is the relay wired correctly in order to reverse the polarity. I'm not hearing a click when I press the A/C button. Bad relay? I had one of these wu tang ti relays fail on my fuel pump a while back so thats a possibility. Constant Voltage at 86 also drop significantly when I connect it to the mazda wire, ground issue? Quote Link to comment Share on other sites More sharing options...
rl Posted April 13, 2010 Report Share Posted April 13, 2010 Ground 30 and 85, 86 will be the 12v+ trigger and 87 will be the negative output. Edit I read your post wrong. You need a latching relay to keep 12v going to the GM request or a momentary? Quote Link to comment Share on other sites More sharing options...
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