Carbide 150cc charging help!
 

So I'm having issues with the regulator. When I put a multimeter on the battery, the voltages jump around. It never stays the same and jumps around from 18v to 12v. It's weird because it does this even with the regulator not plugged in. I even bought a new regulator but does the same thing. I am confused because my wires on the harness have different colors from the regulator and from the wires on the diagram.

https://farm3.staticflickr.com/2944/...2f63d14d_c.jpgvoltage regulator help chart by adcoste1320, on Flickr

https://farm3.staticflickr.com/2944/...2e588a64_c.jpg150cc wiring diagram by adcoste1320, on Flickr

And is this buggy supposed to use a resistor? I would think so but it doesn't show on the diagram. If anyone has pics of their carbide wiring that would be awesome.