I moved the circuit into the cabin today. This should have been a short ordeal, but it really wasn't. For the life of me, I could not find an easy and quick ground for this circuit. I finally ended up finding a unused hole on the steering column and bolted the wire to it.
While I was moving the circuit into the cabin, I also added a toggle switch to it. Now I can turn my alternator on and off at will. I tested it and it works great!
Here are some pictures of the process.
The fuse wire now runs through the firewall into the cabin.
I stuffed the circuit in the glove box for the time being. I'll tidy it up after its all in there and working.
Then, I had a heck of a time finding a ground... I really don't know what else to say. This really shouldn't be a hard thing to do, but it seemed to take me for forever.
The switch is currently just on a wire and I have to grab it and flick it on. I tried it on a quick drive tonight and it works beautifully. I will be adding the amp hour meter once I get it. But, in the mean time I think I'll hookup a 200A ammeter that I have kicking around. That should show me roughly how much power I'm getting with the regenerative braking.