trailer wireing
i purchased 2 of the single connector drop leads for the blinker connections and a triple drop for the brakes 
http://tricled.com/TricLed.com/GS_RS_order_page.html 
if you go to this page and scroll to the bottom area you will see 
"Hardware that make installation easier and faster
                 OEM style connectors"
it shows the 4 type connectors 
they make a single  a double a triple and the 5 pin connector
what you need is the single connector X2
and one of the triple connectors 
after you get these you will open the back of your spyder splash pan up and locate the  connectors inside 
disconnect ONE of the triples from either the left or the right brakes  and insert the new on in the open one both plugs close the circuit and  leave you 3 wires to tap into without Cutting the original wires and  keep it water tight 
the turn signals i had to play with there is a white and a black wire  for them at first i had the white wire used for the new single drop but  the lights didn't work properly so i put them on the black and everything  worked fine 
i hope this helps out 
after they are connected make your pigtail come down add a 5 pin plug to  the  end  wire the trailer to match and you have a great lighting set  up for the trailer  
i noticed the trailer needs LED lights to not mess with the bike  if the  trailer has standard lights your blinkers will be way to fast 
if you have anymore questions let me know ill try to help 
David