left channel isn't working right?

[daqid]

i have a pioneer 760w 2channel amp pushing two 12" kicker c12s, just a little setup till i get some more money. when i bridge them they both play good but amp cuts out after a couple of minutes so now i have one going to each channel. now the right sub plays good but the left one is barely moving. i tried reversing the RCAs but still does the same thing. any help would be greatly appreciated.

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