When i turn my two 12" kicker l7 up they cut out

The CX1200.1 amp is 2 ohm stable. Hopefully, you have the 4 ohm DVC version of the Solo-Baric L7. If so, connect the DVCs in parallel (both positives together, both negatives together) to the amp. This will maximize the output power of the amp. If you have the 2 ohm DVC version of the Solo-Baric L7, the best you can do is connect the DVCs in series to the amp. This will cut the output power in half, though.

Sounds like your wiring is giving you the wrong impedance,Check crutch field advisors website for sub box construction and detailed wiring instructions.

To be on the safe side without further information I would hook the two subs up in series leaving you with an 8 ohm load.

If it is the amplifier that is shutting on and off:
Check to make sure the power and ground wires for the amp are secure, with no fraying, knicks or exposed wire. Check your fuses and connections to make sure everything is correct. Also look at the grounding location. be sure there is exposed metal around the grounding point (paint may cause intermittent power problems). Lastly, the amplifier's remote wire may be improperly secured to the wiring harness. Check the harness for exposed wire grounding out connections.
If the amplifier is continuously on, the subwoofer may be to blame. Check and double check wiring schematics to ensure correct ohms rating.

On the amp there should be High pass and a low pass setting. Put it on low pass cause if its on high pass or in between it produces normal noted like a speaker. Low pass will filter out all the high frequencies.

the kicker l7 will handle all that amp will put out .. bridge the amp and hold on

You have a 2 ohm stable amp, and dual voice coil subs.. The L7's come in both Dual 4 ohm, and Dual 2 ohm, so you have to know what impedance your coils are prior to wiring. HERE is a nifty little guide that will show you how to wire your subs. DO NOT WIRE THE SUBS LOWER THAN 2 OHMS ON YOUR AMPLIFIER!

Im guessing that it is possibly blown... either you ran too much power to it, or it was hooked up wrong... you should unscrew the sub from the box and look inside to make sure that it is connected correctly.... positive to positive, negative to negative,,, if they so much as touched then the L7 could very well be blown.... smell the magnet and if you smell a burnt smell... it is blown... maybe turn your amp down a little... its possible that it is also in protect mode because you are running too many watts to the amp. Feel free to ask if you have any other questions.... Please rate! :D And good luck... i really hope its not burnt out. that stuff is not cheap.

hook them up parellel for 1ohm load

sell me the subs it would be better