Hi, I've done a few conversions and they're pretty easy. I looked around for your specific supply and can't seem to find the exact pinout details. You might need to do a bunch of searches. The basic steps you'll need to follow are listed below.

Here's the thread I followed to convert mine.
http://www.rcgroups.com/forums/showthread.php?t=1292514

1. Identify the input 120v side. If there's a power plug that's great. If not, you'll need to take it apart and try and see if you can figure it out. Be very carefull, the stored current/voltage can kill you.
2. Once input is identified, identify the power on pin. Look at all the other supply diagrams to see if you can figure out one that matches yours.
3. Now that you got the unit to power on, measure the voltages until you find the +12.
4. Install banana plugs to the +12 and Ground to use for your charger.

Enjoy your new supply. Based on the tag yours will put out a ton of current.

Good luck!!!