Question: Low voltage on Heat Bed terminals? (no replies)

Hello everyone;

Printer: 3Up V2
RAMPS 1.4 board

I'm trying to troubleshoot what I think might be a problem with my heated bed: The bed heats well to about 60c, then from 60 to the target of 65 it takes about 30 minutes. I have 12v going into the board, but the voltage taken at the Heat Bed terminals is pulsing between 3 and 4 volts.

Is this normal? If not, any ideas on what I should do next?

Thanks in advance;
Joe