Heated Bed Issues

I just installed a heated bed on my printer and could not get it to power at first. I increased the thickness of the wire coming from the PSU (12v 20A) and can get power to the bed but it interferes with powering the hotend. When I start the heated bed first, I cannot get power to the hotend, but when I start the hotend first then I can get power to the bed. I thought, "well fine I'll just have to remember that," but when I went to print, the hot end turned off while the bed kept on. For some reason, the x-axis did not stop when it got to its commanded position, so I had to reset the printer. When I did that, the hot end turned back on and heated bed turned off and the x-axis reversed direction towards home.

No idea what's causing this but could anyone offer some advice?

MEGA 2560, RAMPS 1.4, Sprinter, Repetier-Host, MK1 heated bed, 12V 20A PSU.

are you using a pc psu or a regulated power switching psu, if you are using a pc power supply many pc psu needs a load in the 5v rail to get a stable 12v

or you could try with marlin firmware i have no problem with this firmware with the same electronics samps 1.4 heatbed, arduino mega 2560 r3, Graphic lcd, SD reader and 2 fans

RicardoGA Wrote:
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> are you using a pc psu or a regulated power
> switching psu, if you are using a pc power supply
> many pc psu needs a load in the 5v rail to get a
> stable 12v

+1.

I have a couple of light bulbs on the 5v rail, and they are absolutely necessary to keep good voltage on the 12v.