No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting (13 replies)

I'm building a Mendelmax 1.5 on a Arduino 2560 and RAMPS 1.4

I was able to get the heatbed(Mk1A also have MK2b) and hotend to work one time and now it no longer works.

I get the fan to turn on via D9

I'm not getting any 12 voltage from 11A on the D8+ and D10+

I get 12 voltage from 11A to D8- and D10-

I also did a continuity test on the thermistor, D8 wires and D10 wires and all got beeps

I'm using a 12V power supply

I have the motherboard set to 33 and the hot bed sensor to 6.

The hot bed temperature just reads 308C or 832C and it just drops when I turn it on.

Someone mentioned that the hot bed thermistor shorted so I ordered 2 more and still doesn't work.