rear defrost

Well, I can't believe I missed this: Why not just wire the blue wire programmed for a pulsed output to a relay that connects the black wire on the ground side of the defog switch ( or any ground for that matter) to the GREEN/ YELLOW wire on the other side of the switch? (pg 24). This would simulate pushing the switch. Of course, I'm assuming the switch is a momentary switch, not a on/off switch. 85 -200mA pulsed from viper (wire #5 of the remote start aux output) 86 +12V 30 tapped to black wire on defog switch (or any ground) 87 tapped to yel/grn wire on defog switch The rear defog should behave just as if you manually pushed the switch. This should work since the switch is not a data signal but a simple ground signal.

t&t tech wrote: You run very minimal risk of "burning the output of the defroster from the remote start output" as mentioned by Mr. Joebubba, if you connect it to the negative trigger from the switch, there are two possibilities, it works or it doesn't! Is the susupect wire thin or thick gauge?

Now how is it possible that the post to the top of this page was now thought of?

Had he answered my original question, this thread would have ended a long time ago!  The answer lies right in the original poster's first post!

There is also a possibility you may not need the relay, just conect the defrost output directly to the trigger wire at the switch, again it either works or it doesn't, if it doesn't you insert the relay!

Geez!

commit your way to jehovah and he will act in your behalf. psalms 37:5

Well, believe it or not, it was original and didn't come from your post...but thanks for playing and being such a stand up guy!!!

t&t tech wrote: ....it's just that, as sherlock would say it,  the answer is elementary my dear watson! Cheers! lol

Couldn't agree more. I'm an amateur, but I can't believe I didn't see that to start with.

Or connect a wire to each side of the switch and then to a relay that will complete the connection when pulsed by the alarm. Then you don't have to worry about what voltage/polarity the switch expects to see on which side, it just simulates you pushing the button.