Two questions for anyone that has done this. I am adding a remote start/alarm to my 5mt WRX.
First, I'm trying to figure out the best way to hook up the neutral safety wire. The best I've come up with is with two relays. The first would have have the neutral safety wire on the + side and the status output from the alarm on the - side. Ground to 30 and the alarm's neutral safety wire on 87. Splice 87 on that wire to the - side of the second relay. The + side would be the starter wire. 30 would be one side of the clutch switch and 87 would be the other. There is one potential problem with this setup: I don't know for sure if the status output transmits before or after checking the neutral safety wire. Do any of you know for sure? If it transmits after checking the safety wires, this obviously wouldn't work. The only alternative I see is to ground the alarm's neutral safety wire and just use some relays to bypass the clutch wire during every start, not only during remote starts. The problem with this is that the alarm would try to start even if the car were in gear, even though the clutch wouldn't let it.
Second, has anyone used an output from the alarm to trigger the defrost wire? It seems like it would just require a + or - pulse, but I haven't checked it out yet. Any ideas?
Sorry about the novel, thanks in advance for any help.