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Mark III Centurion???

I have a Peavey 130 watt @ 4 ohms Mark III Centurion. I am running one 8 ohm 15" cab I was wondering if it was possible to plug into both outputs in the back and send it to the one input in the back of my cab in order to get my full 4 ohms...
 
The speaker jacks in your amp are connected in parallel with one another. Plugging two cables into one speaker cabinet won't change the load that it presents to the amp.

To load the amp to 4 ohms in order to draw full power, you'd need to add another 8 ohm cabinet or replace your existing cabinet with one rated 4 ohms. You'd probably get better results adding another 8 ohm cabinet.