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I've done this per the instructions for the high beam switch. I didn't use the optional zener and haven't had any problems with shorting out the remote. I placed it in the front passenger wheel well. Very easy if you follow the instructions.
Thanks to Modifry's very clear directions on his mods page, and a quick trip to You-Do-It Electronics, I now have my garage door opener hooked up to my "set" cruise control button and it works great!! It took me a little while, mostly because a) it's hard to move around under the dash there, and b) I was terrified of doing something wrong, but it was really easy and I'm pleased as punch with the results. I opted not to do the zener diode, figuring I could always throw it in later, and my unit works fine with ~12V.
Thanks Modifry!
--Glen
P.S. Btw - the black wire on the cruise control harness (third from the right when held so the locking clip faces you) is a ground, that's the one I connected the other lead from the opener to.
I was about to do the mod then I thought up a easier one!
I used double stick velcro and stuck the big ugly opener under the dash where it doesn't show - you have to know where it is to use it - kind of to the right of and under/behind the steering wheel there's a large vacant space. Above your right knee. Very easy to push the button when you pull up home.