I have this mysterious power drain on the battery and cant figure it out. I want to hard wire the battery with interior switch. Are there kits out there or how would I go about it?

 

Not unless you use a similar type master switch like the drag racers use at the rear of the car when the battery is installed at the rear. It needs to be big enough to handle cranking amperage through the switch.

I'd just find out why the battery is draining.

 

That's right. An easy way is to connect a multimeter on current setting inbetween your battery and positive terminals. Then pull fuses and see which one cuts off the current flow. You'll know it's on that circuit. That'll narrow it down.