When bridging a 2 channel amp, what is the difference between the + & - marked bridged and the other + & - ? I have an alpine v12 that i was considering putting on my highs, but the + terminal where it says bridged is broken. I was basically wondering if i could put my wires on the other 2.

 

You need wires on all 4 for most amps. The other two are connected together. This could be done internally if the amp has a switch for bridged mode, but if that is the case, then you have to use the marked terminals.