Ok. So lets go over this carefully. You put a 16V battery in your car. You don't have a 16V alternator, you have a 12V alternator. So you aren't going to be able to charge a battery with 16V worth of cells with an alternator that puts out 12V. Race cars that use 16V batteries do one of two things. They either use a 16V alternator, or they don't use an alternator if it's a drag car. Even if you did get a 16V alternator (which put out around 18.x volts to charge a 16V battery), you then have an entire cars worth of 12V electronics that will have much higher power dissipation than they would at their normal 12V range. All of your lights would be brighter, but they'd have a fraction of their normal lifespan, and things like your ECU and radio are going to run hotter.
I'm willing to bet your battery won't hold a charge because you've fried something which is now making a short to ground. (I see you have a carb, so nevermind around the ECU).

I don't know why you'd do something like this without knowing anything about what you're doing.

 

It was more that I wasn't thinking at all, rather than just not understanding.

The new battery that is in it holds a charge so I didn't kill anything else, and yeah the lights and stuff were awesome! Was like a brand new car for the 24hrs it ran.

Anyways we fixed it, shes gone.

 

That's my point. If it has a 16V battery in it, it isn't fixed. I'm done arguing this though, I'm glad you think it's fixed.

 

No, the new owner put his own regular battery in it, I still have my 16V. I'm not hooking it up to any car again.