It's a voltage regulator.....and 3 grounding wires.
The voltage regulator is simple. Positive and Negative terminals.
BUT: The 3 other ground wires coming from the box. Which is the best place to ground them?
Here's a link to the kit I got.
http://www.inlinefour.com/budclubeargr.html
I belive 1 wire grounds to chassis.....Others to Block, Tranny, Intake Manifold? :P
PS: instructions in Japanese. =(