Hi, I have most of this figured out, like where its going to go (inside the trim under steering wheel). And how to wire the remote to a button, etc.

What I want to know is if I were to hardwire the opener (that takes a MN21 12v battery) to the fuse box, would I blow up the opener, or because they are both 12v, would it be ok?

I know its probably going to be bad for it, so I wanted to know any hints on stepping down the car, if necessary.

 

If the opener takes a 12v battery, then yes, you could hard wire it...

Wire the positive battery terminal on the opener to a 12v power source (fuse box, ignition harness, battery, wherever) and fuse it. Run the negative battery terminal on the opener to a good ground. Probably should fuse that 12v lead, too...

You may be able to get by with some female quick disconnects slipped over the terminals. But if they wont' fit, then you'll need to rough up the surface of the terminals with sandpaper and solder the wires directly to the terminals...

As far as the buttons go, you'll most likely need to desolder the button(s) from the board, and run wires from the board to your switch. I can't imagine that the buttons are anything other than a low current two pin momentary switch, so you can use pretty much any pushbutton switch...

And although it's not a major deal, your range might suffer since the remote is no longer right near the windshield... But if you're only using it right in front of the garage or inside it, you should be fine...