I realize this is a basic electronics question, but know that people on here know electronics.  I couldn't find a very good category to put this in, so I apologize if this is in the wrong section.

I have a 16V 5.6A power supply.  It was from a Laptop I believe.  Input is 100-250V auto switching.  My question is I want to connect the leads to alligator clips.  However, there are 4 wires (red, black, green and white).  According to the schematic (http://www.datasheetdir.com/PW116+download) 2 are +V and 2 are common.  Do I connect both a common and a +V to the alligator clip, or can I just eliminate the commons altogether?  Should one clip be the +V's and one clip the Commons?  Will this also give me a traditional +/- DC or will both be + since both outputs are +V? 

Also, one last thing (just to verify) my understanding is anything under 42VDC is considered "safe" meaning no electrocution under normal handling - despite the fact it is 5.6A.  Most resources on the web seem to muddle the distinction between DC and AC when it comes to "safe" amperage and volts.

Elementary I know...but thanks in advance for the help.

I have one, it was burried at the time, but my wife has unearthed my box that everyone kept hiding my stuff in and moving to random locations..