I did something like this on my motorcycle. I bought a small keychain remote garage door opener that takes a 12volt (MN21/23) battery. I got it from Lowes, I have a Genie Intellicode door opener. I soldered the button contacts together so it was like the button was pushed all the time and connected power and ground from the bike. I had it connected to the high beams so all i had to do was flash my high beams on for a second and my garage door would open. You could do connect it to a button and wire it to accessory or battery power and not have to worry about replacing a battery. Also after I connected it to the bike the range on it was amazing, maybe because it had a little more than 12 volts, not sure. You could also reduce the 12 volts down to whatever you need for your remote, the diy is written up on the R1-forum.
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