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Two loss wires to solder on stereo wireless hp's, both red, which one goes where using multimeter?

hi,
I have two disconnected red wires on the left side cups that need reconnecting to the L- & 3V on the board which you can see on the image below.
https://www.dropbox.com/s/pisf15rkthlnlyk/DSC02001.JPG
https://www.dropbox.com/s/9e97veutva4gpaj/DSC02000.JPG
https://skydrive.live.com/redir?resi...M_vkdGusRCa8oc
https://skydrive.live.com/redir?resi...M_vkdGusRCa8oc

My question as a multi-meter novice, how do a test to know which red wire goes to which point?

Also is there any danger of overheating the board on so small solder points?

Any help much appreciated