71 beetle, new headlights/wires burning up!!!

Hey guys my name is Chris and im new to the forum. I have a 71 beetle with a 64 front end. I purchased these head lights.
 
http://cgi.ebay.com/ebaymotors/59-79-Volkswagen-Beetle-Diamond-Cut-Headlight-63-67-71_W0QQitemZ250153391121QQihZ015QQcategoryZ33710QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
 
 
When I installed them, everything went fine until I turned them on! All of a sudden I saw smoke and quickly turned them off! It burnt the harness for the headlights needless to say :(             The wires that are on there now is not factory. The wires are very thin and look like kite string! Could that be the problem? I just need to know how I can get these lights to work without causing a fire! Any suggestions would be greatly appreciated!!!
 
 
Best Regards, Chris.

polarity  is  wrong.  like positive and negitive   i  assume you are using a twelve volt system for power supply
dissonnect and test  each  wire end  individually  .
 

      The original wireing on the bug was barely efficient, if
  you have installed brighter lights like Halogen or some other super head lights they would almost over load the
 wireing.  If the wireing has been replaced with a smaller
  wire, then it's not heavy enough to handle the extra load,
   and it will surely smoke.