Reply to help multiple grounds gamepad

hello.

i've found this site that explains how to wire gamepads:

http://www.slagcoin.com/joystick/pcb_wiring.html

in the site they talk about "common grounds" or "multiple commons"

many gamepads have just one ground, but there are some gamepads that seems to have diferent grounds.

that is the case of my hacked gamepads, and that is the problem...

i've manage to connect everything well, in my project, each button has a LED that lights when pressed, the LED is connected to a 5v supply, works great with most of the buttons, but in some buttons it doesn't work.

for example:

button 10 and 9 share one common ground, iff i connect the LED i doesn't work...

with the multimer i have 2v for the buttons and GND
iff i try the +5 and GND i get 0.5v
iff i try the GND with the common ground (from buttons 1 to 8) i get 5v

has you can see it's a mess... and i'm not getting there...

does any one have experience with this type of gamepads?

:-|