It's not a stupid question. That's some elaborate wire for what you're doing! The RCA jacks will have the metal flanges that go under the nut like elongated washers. You want those connected together and then wired to ground. I would get some much thinner wire if I were you though. I use 30AWG solid core. It's very nice for fitting in a Game Boy. Just use some hot glue so they don't break off when you go to close it.

Thank you very much!

I went ahead and hooked the RCA's up with thinner wire like you said, and it's working like a charm.
The only weird thing is, that my normal minijack output now only has one channel working. No sound in the other. Hmm.. is this an ordinary thing, or did I screw something up?

EDIT:

OK so I tried making the RCAs on another dmg as well, and this time the minijack out is working fine. So apparently something went wrong with the first attempt.

Wiring all 3 shields to GND would just be cake on cake on cake, and make no sense.
I need other cables... Just delete this thread, please

This might be a very stupid question - I'm sorry!

I've bought everything for making the RCA mod which hopefully will result in some more bass.

The thing is, the 3 cables in my ribbon cable each have their own shield.

So if I were to just go ahead and do this, I would probably just wire all 3 shields to GND on both the gameboy and the RCA's.

This guy however tells not to wire the cable to GND on the side of the cable that goes to output: http://lowgain-audio.com/GBclassicmod.htm
However, that is perhaps another mod - and perhaps I'm just mixing things up.

Here's a picture of my lovely mega-shield-cable:

Should I wire all 3 shields together to GND or just one of them - and then which one?

/Søren