Heat Bed not working at all.

After changing heat bed, the ramps, and arduino all I get now is the LED to flash on very quick every other second. I am using a 15 volt 6 amp wall wort for power on the heat bed side (right) I have power after the fuses both big and smaller one. Im at a total loss could it be the mossfit? and how do you check them?
The bed did work at one point in time but not very well. It would take forever to start to heat and after it did heat it would cool down about 40 deg before it started to heat up again.

Your power supply seems to be under-sized for the typical 200mm square PCB heatbed. The wiki recommends 10 amps, and I've read several complaints that certain power bricks rated for 6A struggle to put out 5A. Just my two cents.....

Have you measured the resistance of your PCB heatbed ?

The resistance in both beds is the same 1.5, Also I was incorrect about the power supply feeding power I have 15v and 12 amp.

So I have changed the ramps yet again and still nothing. Im thinking it it in the set up now. maybe in the PID settings?

You have two heat beds on your printer?

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Waitaki 3D Printer